Paternal Family Tree: Hohenstauffen
On 15th August 1209 [his father] Frederick I King Jerusalem II Holy Roman Emperor [aged 14] and Constance Barcelona [aged 30] were married at Messina, Sicily [Map]. She the daughter of Alfonso II King Aragon and Sancha Ivrea Queen Consort Aragon. He the son of [his grandfather] Henry Hohenstaufen VI Holy Roman Emperor. They were third cousin once removed.
On 9th November 1225 [his father] Frederick I King Jerusalem II Holy Roman Emperor [aged 30] and [his mother] Isabella Brienne II Queen Jerusalem [aged 13] were married. He by marriage John I King Jerusalem. She the daughter of [his grandfather] John de Brienne I King Jerusalem [aged 55] and [his grandmother] Maria the Marquise Unknown. He the son of Henry Hohenstaufen VI Holy Roman Emperor.
On 25th April 1228 Conrad Hohenstaufen King Germany was born to Frederick I King Jerusalem II Holy Roman Emperor [aged 33] and Isabella Brienne II Queen Jerusalem [aged 16].
On 20th July 1235 [his father] Frederick I King Jerusalem II Holy Roman Emperor [aged 40] and [his step-mother] Isabella Plantagenet Holy Roman Empress [aged 21] were married at Worms Cathedral [Map]. She the daughter of King John of England and Isabella of Angoulême Queen Consort England [aged 47]. He the son of [his grandfather] Henry Hohenstaufen VI Holy Roman Emperor. They were fourth cousin once removed.
On 12th February 1242 [his half-brother] Henry VII King Germany [aged 31] died. His half brother Conrad [aged 13] succeeded King Germany.
On 13th December 1250 [his father] Frederick I King Jerusalem II Holy Roman Emperor [aged 55] died. [his half-brother] Henry VII King Germany was appointed VII King Germany.
On 21st May 1254 Conrad Hohenstaufen King Germany [aged 26] died.
Kings Wessex: Great x 10 Grand Son of King Alfred "The Great" of Wessex
Kings France: Great x 13 Grand Son of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 2 Grandfather: Frederick "One Eyed" Hohenstaufen I Holy Roman Emperor 
Great x 1 Grandfather: Frederick "Barbarossa" Hohenstaufen I Holy Roman Emperor 7 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandfather: Welf I Duke Bavaria
Great x 3 Grandfather: Henry "Black" Welf IX Duke Bavaria 5 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandmother: Judith Flanders Duchess Bavaria 4 x Great Granddaughter of King Alfred "The Great" of Wessex
Great x 2 Grandmother: Judith Welf Holy Roman Empress 6 x Great Granddaughter of King Alfred "The Great" of Wessex
Great x 4 Grandfather: Magnus Billung Duke Saxony
Great x 3 Grandmother: Wulfhilde of Saxony Duchess Bavaria
Grandfather: Henry Hohenstaufen VI Holy Roman Emperor 8 x Great Grandson of King Alfred "The Great" of Wessex
Great x 4 Grandfather: William I Count Burgundy 
8 x Great Grandson of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 3 Grandfather: Stephen Ivrea I Count Burgundy 9 x Great Grandson of Charles "Charlemagne aka Great" King of the Franks King Lombardy Holy Roman Emperor
Great x 4 Grandmother: Ettiennette Countess Burgundy
Great x 2 Grandfather: Reginald Ivrea III Count Burgundy 6 x Great Grandson of King Edward "Elder" of the Anglo Saxons
Great x 4 Grandfather: Gerard Metz I Duke Lorraine
Great x 3 Grandmother: Beatrice Metz Countess Burgundy 5 x Great Granddaughter of King Edward "Elder" of the Anglo Saxons
Great x 4 Grandmother: Hedwige Namur Duchess Lorraine 4 x Great Granddaughter of King Edward "Elder" of the Anglo Saxons
Great x 1 Grandmother: Beatrice of Burgundy Holy Roman Empress 7 x Great Granddaughter of King Edward "Elder" of the Anglo Saxons
father: Frederick I King Jerusalem II Holy Roman Emperor 9 x Great Grandson of King Alfred "The Great" of Wessex
Conrad Hohenstaufen King Germany 10 x Great Grandson of King Alfred "The Great" of Wessex
Great x 1 Grandfather: Erard Brienne II Count Brienne
Grandfather: John de Brienne I King Jerusalem
Great x 2 Grandfather: Amadeus Montfaucon
Great x 1 Grandmother: Agnès Montfaucon Countess Brienne
mother: Isabella Brienne II Queen Jerusalem
Grandmother: Maria the Marquise Unknown