Paternal Family Tree: Wittelsbach
Maternal Family Tree: Elizabeth Cuman
In 1308 [his father] Louis Wittelsbach IV Holy Roman Emperor [aged 25] and Beatrix Świdnica Holy Roman Empress were married. She by marriage Holy Roman Empress. He the son of [his grandfather] Louis "Strict" Wittelsbach II Duke Upper Bavaria and [his grandmother] Matilda Habsburg Duchess Bavaria.
In 1324 [his father] Louis Wittelsbach IV Holy Roman Emperor [aged 41] and [his mother] Margaret Hainaut Holy Roman Empress [aged 12] were married. She by marriage Holy Roman Empress. The difference in their ages was 29 years. She the daughter of [his grandfather] William of Avesnes I Count Hainaut III Count Avesnes III Count Holland II Count Zeeland [aged 38] and [his grandmother] Joan Valois Countess Zeeland Holland Avesnes and Hainaut [aged 30]. He the son of Louis "Strict" Wittelsbach II Duke Upper Bavaria and Matilda Habsburg Duchess Bavaria. They were third cousin three times removed. He a great x 3 grandson of King Henry "Curtmantle" II of England. She a great x 5 granddaughter of King Stephen I England.
On 12th May 1330 William Wittelsbach I Duke Lower Bavaria was born to Louis Wittelsbach IV Holy Roman Emperor [aged 48] and Margaret Hainaut Holy Roman Empress [aged 18]. He a great x 4 grandson of King Henry "Curtmantle" II of England.
In 1344 Ralph Stafford and [his future wife] Maud Plantagenet Duchess Lower Bavaria [aged 3] were married. She the daughter of [his future father-in-law] Henry of Grosmont 1st Duke Lancaster [aged 34] and [his future mother-in-law] Isabel Beaumont Duchess Lancaster [aged 24]. He the son of Ralph Stafford 1st Earl Stafford [aged 42] and Margaret Audley Countess Stafford [aged 26]. They were third cousin once removed. He a great x 2 grandson of King Edward I of England. She a great x 2 granddaughter of King Henry III of England.
In 1345 William Wittelsbach I Duke Lower Bavaria [aged 14] succeeded V Count Holland.
On 26th September 1345 [his uncle] William Hainaut II Count Hainaut [aged 38] was killed at the Battle of Warns. His sister [his mother] Margaret [aged 33] succeeded II Countess Hainaut. [his father] Louis Wittelsbach IV Holy Roman Emperor [aged 63] by marriage Count Hainaut.
In 1347 William Wittelsbach I Duke Lower Bavaria [aged 16] succeeded I Duke Lower Bavaria.
On 11th October 1347 [his father] Louis Wittelsbach IV Holy Roman Emperor [aged 65] died. His son [his half-brother] Stephen [aged 28] succeeded II Duke Bavaria. [his sister-in-law] Elisabeth Barcelona Duchess Bavaria [aged 37] by marriage Duchess Bavaria. His son [his brother] Albert [aged 11] succeeded I Duke Lower Bavaria.
In 1352 William Wittelsbach I Duke Lower Bavaria [aged 21] and Maud Plantagenet Duchess Lower Bavaria [aged 11] were married in London. She by marriage Duchess Lower Bavaria. He by marriage Earl of Leicester. She the daughter of Henry of Grosmont 1st Duke Lancaster [aged 42] and Isabel Beaumont Duchess Lancaster [aged 32]. He the son of Louis Wittelsbach IV Holy Roman Emperor and Margaret Hainaut Holy Roman Empress [aged 40]. They were fourth cousin once removed. He a great x 4 grandson of King Henry "Curtmantle" II of England. She a great x 2 granddaughter of King Henry III of England.
After 19th July 1353 [his brother] Albert Wittelsbach I Duke Lower Bavaria [aged 16] and [his sister-in-law] Margaret of Silesia Duchesa Lowwer Bavaria [aged 11] were married. She by marriage Duchess Lower Bavaria. He the son of [his father] Louis Wittelsbach IV Holy Roman Emperor and [his mother] Margaret Hainaut Holy Roman Empress [aged 41].
The Deeds of the Dukes of Normandy
The Gesta Normannorum Ducum [The Deeds of the Dukes of Normandy] is a landmark medieval chronicle tracing the rise and fall of the Norman dynasty from its early roots through the pivotal events surrounding the Norman Conquest of England. Originally penned in Latin by the monk William of Jumièges shortly before 1060 and later expanded at the behest of William the Conqueror, the work chronicles the deeds, politics, battles, and leadership of the Norman dukes, especially William’s own claim to the English throne. The narrative combines earlier historical sources with firsthand information and oral testimony to present an authoritative account of Normandy’s transformation from a Viking settlement into one of medieval Europe’s most powerful realms. William’s history emphasizes the legitimacy, military prowess, and governance of the Norman line, framing their expansion, including the conquest of England, as both divinely sanctioned and noble in purpose. Later chroniclers such as Orderic Vitalis and Robert of Torigni continued the history, extending the coverage into the 12th century, providing broader context on ducal rule and its impact. Today this classic work remains a foundational source for understanding Norman identity, medieval statesmanship, and the historical forces that reshaped England and Western Europe between 800AD and 1100AD.
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In 1354 William Wittelsbach I Duke Lower Bavaria [aged 23] succeeded V Count Hainaut, V Count Zeeland.
In 1356 [his daughter] Unamed Wittelsbach was born to William Wittelsbach I Duke Lower Bavaria [aged 25] and [his wife] Maud Plantagenet Duchess Lower Bavaria [aged 15]. She a great x 3 granddaughter of King Henry III of England. She died aged less than one years old.
In 1356 [his daughter] Unamed Wittelsbach died.
On 18th September 1361 [his half-brother] Louis "The Brandenburger" Wittelsbach V Duke Bavaria [aged 45] died.
On 10th April 1362 [his wife] Maud Plantagenet Duchess Lower Bavaria [aged 22] died. Her sister [his sister-in-law] Blanche [aged 20] succeeded 6th Countess of Leicester. John of Gaunt 1st Duke Lancaster [aged 22] by marriage Earl of Leicester adding a fourth Earldom to the ones he already held: Earl Richmond, Earl Lancaster and Earl Derby.
On 17th May 1365 [his brother] Louis "The Roman" Wittelsbach VI Duke Upper Bavaria [aged 37] died.
In 1369 [his mother] Margaret Hainaut Holy Roman Empress [aged 57] died.
On 13th May 1375 [his half-brother] Stephen Wittelsbach II Duke Bavaria [aged 56] died. His son [his nephew] Stephen [aged 38] succeeded III Duke Bavaria.
On 16th November 1379 [his brother] Otto "The Bavarian" Wittelsbach V Duke Bavaria [aged 38] died.
On 15th April 1389 William Wittelsbach I Duke Lower Bavaria [aged 58] died.
Chronicle of Geoffrey le Baker of Swinbroke. In this year, while the Lord Duke of Lancaster had gone to Prussia, and was then staying with the King of Kraków and Poland, engaged in action against the Turks, his daughter was betrothed in England, with the advice of the king and by official arrangement, to Lord William, Duke of Zeeland,1 the firstborn son of the late [his father] Louis, Duke of Bavaria, who had been a usurper of the Holy Roman Empire.
Hoc anno domino duce Lancastrie Spruciam profecto et deinde apud regem Crakkowye et Polonie contra Turcos demorante, filia sua domino duci Selandie Willelmo, primogenito quondam Ludowici ducis Bavarie, intrusoris imperii Romani, fuit in Anglia desponsata de concilio regis et ordinacione.
Note 1. William the Mad, count of Holland, son of Louis of Bavaria by his second marriage with Margaret of Hainaut, queen Philippa's sister, married Maud, elder daughter of the duke of Lancaster, who had previously been married to Ralph, son of Ralph lord Stafford. She died in 1362.
Kings Wessex: Great x 9 Grand Son of King Edmund "Ironside" I of England
Kings Godwinson: Great x 9 Grand Son of King Harold II of England
Kings England: Great x 4 Grand Son of King Henry "Curtmantle" II of England
Kings Scotland: Great x 7 Grand Son of King Malcolm III of Scotland
Kings France: Great x 2 Grand Son of King Philip III of France
Kings Duke Aquitaine: Great x 13 Grand Son of Ranulf I Duke Aquitaine
Kings Spain: Great x 5 Grand Son of Alfonso II King Aragon
Great x 3 Grandfather: Otto Wittelsbach I Duke Bavaria 
Great x 2 Grandfather: Louis Wittelsbach I Duke Bavaria
Great x 4 Grandfather: Louis I Count Loon
Great x 3 Grandmother: Agnes of Loon
Great x 4 Grandmother: Agnes Metz Countess Loon
Great x 1 Grandfather: Otto "Illustrious" Wittelsbach II Duke Bavaria
Great x 3 Grandfather: Frederick Bohemia Duke Bohemia
Great x 2 Grandmother: Ludmilla Bohemia Duchess Bavaria
Grandfather: Louis "Strict" Wittelsbach II Duke Upper Bavaria 2 x Great Grandson of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Henry "Proud" Welf X Duke Bavaria 6 x Great Grandson of King Alfred "The Great" of Wessex
Great x 3 Grandfather: Henry "Lion" Welf XII Duke Saxony III Duke Bavaria 7 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandmother: Gertrude Süpplingenburg Duchess Bavaria
Great x 2 Grandfather: Henry Welf V Count Palatine of the Rhine Grandson of King Henry "Curtmantle" II of England
Great x 4 Grandfather: King Henry "Curtmantle" II of England 
Grandson of King Henry I "Beauclerc" England
Great x 3 Grandmother: Matilda Plantagenet Duchess Saxony daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Eleanor of Aquitaine Queen Consort Franks and England 4 x Great Granddaughter of Hugh I King of the Franks
Great x 1 Grandmother: Agnes Welf Duchess Bavaria Great Granddaughter of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Conrad Palatine Count Palatine
Great x 2 Grandmother: Agnes Palatine of the Rhine
father: Louis Wittelsbach IV Holy Roman Emperor 3 x Great Grandson of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Albert III Count of Habsburg
Great x 3 Grandfather: Rudolph II Count of Habsburg 9 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandmother: Ida of Pfullendorf 8 x Great Granddaughter of King Alfred "The Great" of Wessex
Great x 2 Grandfather: Albert IV Count of Habsburg 10 x Great Grandson of King Alfred "The Great" of Wessex
Great x 3 Grandmother: Agnes of Staufen
Great x 1 Grandfather: Rudolph I King Romans 11 x Great Grandson of King Alfred "The Great" of Wessex
Great x 3 Grandfather: Count Ulrich of Kyburg
Great x 2 Grandmother: Hedwig of Kyburg
Grandmother: Matilda Habsburg Duchess Bavaria 12 x Great Granddaughter of King Alfred "The Great" of Wessex
Great x 2 Grandfather: Burkhard V Count Hohenberg
Great x 1 Grandmother: Gertrude Hohenburg
Great x 3 Grandfather: Rudolph II Count Palatine of Tubingen
Great x 2 Grandmother: Mathilda of Tubingen
William Wittelsbach I Duke Lower Bavaria 2 x Great Grandson of King Philip III of France
Great x 4 Grandfather: James Avesnes
Great x 3 Grandfather: Bouchard Avesnes
Great x 4 Grandmother: Adela Guise
Great x 2 Grandfather: John of Avesnes I Count Hainaut 4 x Great Grandson of King William "Conqueror" I of England
Great x 4 Grandfather: Baldwin IX Count Flanders VI Count Hainaut 5 x Great Grandson of Hugh I King of the Franks
Great x 3 Grandmother: Margaret II Countess Flanders 3 x Great Granddaughter of King William "Conqueror" I of England
Great x 4 Grandmother: Marie Blois Countess Flanders 
2 x Great Granddaughter of King William "Conqueror" I of England
Great x 1 Grandfather: John of Avesnes II Count Hainaut II Count Holland 3 x Great Grandson of King Stephen I England
Great x 4 Grandfather: William Gerulfing I Count Holland 
Great Grandson of King David I of Scotland
Great x 3 Grandfather: Floris Gerulfing IV Count Holland 2 x Great Grandson of King David I of Scotland
Great x 4 Grandmother: Adelaide Guelders Countess Holland
Great x 2 Grandmother: Adelaide Gerulfing Countess Hainaut 2 x Great Granddaughter of King Stephen I England
Great x 4 Grandfather: Henry Reginar VIII Duke Lower Lorraine I Duke Brabant 8 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 3 Grandmother: Mathilde Reginar Countess Holland and Palatine Great Granddaughter of King Stephen I England
Great x 4 Grandmother: Maud Metz Granddaughter of King Stephen I England
Grandfather: William of Avesnes I Count Hainaut III Count Avesnes III Count Holland II Count Zeeland 4 x Great Grandson of King Stephen I England
Great x 4 Grandfather: Henry Luxemburg III Duke Limburg 
9 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 3 Grandfather: Waleran Luxemburg III Duke Limburg 10 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 4 Grandmother: Sophia Saarbrücken Duchess Limburg
Great x 2 Grandfather: Henry "Great" Luxemburg V Count Luxemburg III Count Namur 8 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 4 Grandfather: Henry "Blind" Namur IV Count Luxemburg I Count Namur 6 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 3 Grandmother: Erminsende Namur Countess of Bar 7 x Great Granddaughter of King Edward "Elder" of the Anglo Saxons
Great x 4 Grandmother: Agnes Guelders Countess Namur and Luxemburg
Great x 1 Grandmother: Philippa Luxemburg Countess Hainaut and Holland 5 x Great Granddaughter of King William "Conqueror" I of England
Great x 4 Grandfather: Theobald of Bar I Count of Bar 2 x Great Grandson of King William "Conqueror" I of England
Great x 3 Grandfather: Henry of Bar II Count of Bar 3 x Great Grandson of King William "Conqueror" I of England
Great x 4 Grandmother: Erminsende of Bar Sur Seine Countess Bar
Great x 2 Grandmother: Margaret of Bar Countess Luxemburg and Namur 4 x Great Granddaughter of King William "Conqueror" I of England
Great x 4 Grandfather: Robert Capet II Count Dreux 
4 x Great Grandson of Hugh I King of the Franks
Great x 3 Grandmother: Philippa Capet Countess of Bar 5 x Great Granddaughter of Hugh I King of the Franks
Great x 4 Grandmother: Yolande Coucy Countess Dreux 5 x Great Granddaughter of Hugh I King of the Franks
mother: Margaret Hainaut Holy Roman Empress Great Granddaughter of King Philip III of France
Great x 4 Grandfather: King Louis VIII of France son of King Philip II of France
Great x 3 Grandfather: King Louis IX of France son of King Louis VIII of France
Great x 4 Grandmother: Blanche Ivrea Queen Consort France 
Granddaughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: King Philip III of France son of King Louis IX of France
Great x 4 Grandfather: Raymond IV Count Provence 
Grandson of Alfonso II King Aragon
Great x 3 Grandmother: Margaret Provence Queen Consort France Great Granddaughter of Alfonso II King Aragon
Great x 4 Grandmother: Beatrice Savoy Countess Provence 13 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 1 Grandfather: Charles Valois I Count Valois son of King Philip III of France
Great x 4 Grandfather: Peter II King Aragon son of Alfonso II King Aragon
Great x 3 Grandfather: James I King Aragon Grandson of Alfonso II King Aragon
Great x 4 Grandmother: Marie Montpellier Queen Consort Aragon
Great x 2 Grandmother: Isabella Barcelona Queen Consort France Great Granddaughter of Alfonso II King Aragon
Great x 4 Grandfather: King Andrew II of Hungary 3 x Great Grandson of King Harold II of England
Great x 3 Grandmother: Violant Árpád Queen Consort Aragon 4 x Great Granddaughter of King Harold II of England
Grandmother: Joan Valois Countess Zeeland Holland Avesnes and Hainaut Granddaughter of King Philip III of France
Great x 4 Grandfather: King Louis VIII of France son of King Philip II of France
Great x 3 Grandfather: King Charles Capet of Sicily son of King Louis VIII of France
Great x 4 Grandmother: Blanche Ivrea Queen Consort France Granddaughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Charles II King Naples Grandson of King Louis VIII of France
Great x 4 Grandfather: Raymond IV Count Provence Grandson of Alfonso II King Aragon
Great x 3 Grandmother: Beatrice Provence Queen Consort Sicily Great Granddaughter of Alfonso II King Aragon
Great x 4 Grandmother: Beatrice Savoy Countess Provence 13 x Great Granddaughter of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 1 Grandmother: Margaret Capet Countess Valois Great Granddaughter of King Louis VIII of France
Great x 4 Grandfather: Béla IV King of Hungary 4 x Great Grandson of King Harold II of England
Great x 3 Grandfather: Stephen V of Hungary 5 x Great Grandson of King Harold II of England
Great x 2 Grandmother: Mary of Hungary Queen Consort Naples 6 x Great Granddaughter of King Harold II of England
Great x 3 Grandmother: Elizabeth Cuman