Paternal Family Tree: William Sinclair 3rd Earl Orkney 1st Earl Caithness
Maternal Family Tree: William Sinclair 3rd Earl Orkney 1st Earl Caithness
William Sinclair 3rd Earl Orkney 1st Earl Caithness and Elizabeth Douglas Countess Buchan and Orkney were married. She by marriage Countess Orkney. She the daughter of Archibald Douglas 1st Duke Touraine and Margaret Stewart Duchess Touraine. He the son of Henry Sinclair 2nd Earl Orkney and Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney. They were half first cousin once removed.
William Sinclair 3rd Earl Orkney 1st Earl Caithness and Janet Yeman Countess Orkney and Caithness were married. She by marriage Countess Orkney, Countess Caithness. He the son of Henry Sinclair 2nd Earl Orkney and Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney.
In 1407 [his father] Henry Sinclair 2nd Earl Orkney [aged 32] and [his mother] Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney [aged 27] were married. Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney by marriage Countess Orkney.
In 1410 William Sinclair 3rd Earl Orkney 1st Earl Caithness was born to Henry Sinclair 2nd Earl Orkney [aged 35] and Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney [aged 30].
Around 1420 [his father] Henry Sinclair 2nd Earl Orkney [aged 45] died. His succeeded son William [aged 10] succeeded 3rd Earl Orkney.
In or after 1425 [his brother-in-law] James "Gross" Douglas 7th Earl Douglas 1st Earl Avondale [aged 54] and [his sister] Beatrix Sinclair Countess Douglas and Avondale [aged 27] were married. Beatrix Sinclair Countess Douglas and Avondale by marriage Countess Douglas, Countess Avondale. The difference in their ages was 27 years. She the daughter of [his father] Henry Sinclair 2nd Earl Orkney and [his mother] Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney [aged 45]. He the son of Archibald "Grim" Douglas 3rd Earl Douglas and Joanna Strathearn Countess Douglas. They were great uncle and niece.
In 1436 [his son] William Sinclair 2nd Lord Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 26] and Elizabeth Douglas Countess Buchan and Orkney. Coefficient of inbreeding 2.40%. He married after 29th April 1458 Christian Leslie Lady Sinclair and had issue.
Around 1438 [his mother] Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney [aged 58] died.
In 1440 [his daughter] Catherine Sinclair Duchess Albany was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 30] and Elizabeth Douglas Countess Buchan and Orkney. Coefficient of inbreeding 2.40%. She married before 1477 her second cousin Alexander Stewart 1st Duke Albany, son of King James II of Scotland and Mary of Guelders Queen Consort Scotland, and had issue.
Adam Murimuth's Continuation and Robert of Avesbury’s 'The Wonderful Deeds of King Edward III'
This volume brings together two of the most important contemporary chronicles for the reign of Edward III and the opening phases of the Hundred Years’ War. Written in Latin by English clerical observers, these texts provide a vivid and authoritative window into the political, diplomatic, and military history of fourteenth-century England and its continental ambitions. Adam Murimuth Continuatio's Chronicarum continues an earlier chronicle into the mid-fourteenth century, offering concise but valuable notices on royal policy, foreign relations, and ecclesiastical affairs. Its annalistic structure makes it especially useful for establishing chronology and tracing the development of events year by year. Complementing it, Robert of Avesbury’s De gestis mirabilibus regis Edwardi tertii is a rich documentary chronicle preserving letters, treaties, and official records alongside narrative passages. It is an indispensable source for understanding Edward III’s claim to the French crown, the conduct of war, and the mechanisms of medieval diplomacy. Together, these works offer scholars, students, and enthusiasts a reliable and unembellished account of a transformative period in English and European history. Essential for anyone interested in medieval chronicles, the Hundred Years’ War, or the reign of Edward III.
Available at Amazon in eBook and Paperback format.
Around 1440 [his daughter] Katherine Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 30] and [his future wife] Marjory Sutherland Countess Orkney and Caithness.
Before 1448 William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 37] and Marjory Sutherland Countess Orkney and Caithness were married. She by marriage Countess Orkney, Countess Caithness. He the son of Henry Sinclair 2nd Earl Orkney and Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney.
In 1448 [his son] Robert Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 38] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Around 1450 [his daughter] Margaret Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 40] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Around 1451 [his daughter] Susan Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 41] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Around 1452 [his son] Arthur Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 42] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
In 1452 [his son] Oliver Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 42] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Around 1453 [his son] George Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 43] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Around 1454 [his son] Alexander Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 44] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
In 1455 William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 45] was created 1st Earl Caithness.
Around 1455 [his daughter] Elizabeth Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 45] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Adam Murimuth's Continuation and Robert of Avesbury’s 'The Wonderful Deeds of King Edward III'
This volume brings together two of the most important contemporary chronicles for the reign of Edward III and the opening phases of the Hundred Years’ War. Written in Latin by English clerical observers, these texts provide a vivid and authoritative window into the political, diplomatic, and military history of fourteenth-century England and its continental ambitions. Adam Murimuth Continuatio's Chronicarum continues an earlier chronicle into the mid-fourteenth century, offering concise but valuable notices on royal policy, foreign relations, and ecclesiastical affairs. Its annalistic structure makes it especially useful for establishing chronology and tracing the development of events year by year. Complementing it, Robert of Avesbury’s De gestis mirabilibus regis Edwardi tertii is a rich documentary chronicle preserving letters, treaties, and official records alongside narrative passages. It is an indispensable source for understanding Edward III’s claim to the French crown, the conduct of war, and the mechanisms of medieval diplomacy. Together, these works offer scholars, students, and enthusiasts a reliable and unembellished account of a transformative period in English and European history. Essential for anyone interested in medieval chronicles, the Hundred Years’ War, or the reign of Edward III.
Available at Amazon in eBook and Paperback format.
Around 1455 [his daughter] Mariota Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 45] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Around 1455 [his daughter] Marjory Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 45] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
In 1457 [his daughter] Eleanor Sinclair Countess Atholl was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 47] and [his wife] Marjory Sutherland Countess Orkney and Caithness. She married before April 1475 her half fifth cousin once removed John Stewart 1st Earl Atholl, son of James "Black Knight of Lorn" Stewart and Joan Beaufort Queen Consort Scotland, and had issue.
After 29th April 1458 William Sinclair 2nd Lord Sinclair [aged 22] and Christian Leslie Lady Sinclair were married. He the son of William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 48] and Elizabeth Douglas Countess Buchan and Orkney.
In 1459 [his son] William Sinclair 2nd Earl Caithness was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 49] and [his wife] Marjory Sutherland Countess Orkney and Caithness at Ravenscraig Castle. He married Margaret Keith Countess Caithness and had issue.
Before 8th February 1462 [his sister] Beatrix Sinclair Countess Douglas and Avondale [aged 64] died.
Around 1470 [his daughter] Euphemia Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 60] and [his wife] Marjory Sutherland Countess Orkney and Caithness.
Before April 1475 [his son-in-law] John Stewart 1st Earl Atholl [aged 35] and Eleanor Sinclair Countess Atholl [aged 18] were married. Eleanor Sinclair Countess Atholl by marriage Countess Atholl. She the daughter of William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 65] and Marjory Sutherland Countess Orkney and Caithness. He the son of James "Black Knight of Lorn" Stewart and Joan Beaufort Queen Consort Scotland. They were half fifth cousin once removed. He a great x 2 grandson of King Edward III of England.
Before 1477 [his son-in-law] Alexander Stewart 1st Duke Albany [aged 22] and Catherine Sinclair Duchess Albany [aged 36] were married. Catherine Sinclair Duchess Albany by marriage Duchess Albany. The marriage was subsequently regarded as illegitimate. She the daughter of William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 66] and Elizabeth Douglas Countess Buchan and Orkney. He the son of King James II of Scotland and Mary of Guelders Queen Consort Scotland. They were second cousins. He a great x 3 grandson of King Edward III of England.
In 1479 [his daughter] Catherine Sinclair Duchess Albany [aged 39] died.
Chronicle of Walter of Guisborough
A canon regular of the Augustinian Guisborough Priory, Yorkshire, formerly known as The Chronicle of Walter of Hemingburgh, describes the period from 1066 to 1346. Before 1274 the Chronicle is based on other works. Thereafter, the Chronicle is original, and a remarkable source for the events of the time. This book provides a translation of the Chronicle from that date. The Latin source for our translation is the 1849 work edited by Hans Claude Hamilton. Hamilton, in his preface, says: 'In the present work we behold perhaps one of the finest samples of our early chronicles, both as regards the value of the events recorded, and the correctness with which they are detailed; Nor will the pleasing style of composition be lightly passed over by those capable of seeing reflected from it the tokens of a vigorous and cultivated mind, and a favourable specimen of the learning and taste of the age in which it was framed.'
Available at Amazon in eBook and Paperback format.
In 1479 [his daughter] Katherine Sinclair [aged 39] died.
Around 1480 [his daughter] Marjory Sinclair [aged 25] died.
In 1484 William Sinclair 3rd Earl Orkney 1st Earl Caithness [aged 74] died. His succeeded son William Sinclair 2nd Earl Caithness [aged 25] succeeded 2nd Earl Caithness. William Sinclair 2nd Lord Sinclair [aged 48] was appointed 2nd Lord Sinclair.
Alexander Stewart and [his mother] Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney were married. He the son of Murdoch Stewart 2nd Duke Albany and Isabel Countess Lennox Duchess Albany. They were half first cousin once removed. She a great x 5 granddaughter of King John of England.
[his daughter] Unamed Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness and Elizabeth Douglas Countess Buchan and Orkney. Coefficient of inbreeding 2.40%.
[his son] David Sinclair was born to William Sinclair 3rd Earl Orkney 1st Earl Caithness.
Kings Wessex: Great x 11 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 7 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 13 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 8 Grand Son of Maredudd ap Bleddyn King Powys
Kings England: Great x 6 Grand Son of King John of England
Kings Scotland: Great Grand Son of King Robert II of Scotland
Kings France: Great x 12 Grand Son of Hugh I King of the Franks
Kings Duke Aquitaine: Great x 16 Grand Son of Ranulf I Duke Aquitaine
Father: Henry Sinclair 2nd Earl Orkney
William Sinclair 3rd Earl Orkney 1st Earl Caithness Great Grand Son of King Robert II of Scotland
Great x 4 Grandfather: William "Longleg" Douglas
Great x 3 Grandfather: William "Hardy" Douglas 2nd Lord Douglas
Great x 4 Grandmother: Constance Battail Battail
Great x 2 Grandfather: James "Black" Douglas 4 x Great Grand Son of King David I of Scotland
Great x 4 Grandfather: Alexander Stewart 4th High Steward 
2 x Great Grand Son of King David I of Scotland
Great x 3 Grandmother: Elizabeth Stewart Baroness Douglas 3 x Great Grand Daughter of King David I of Scotland
Great x 1 Grandfather: Archibald "Grim" Douglas 3rd Earl Douglas 5 x Great Grand Son of King David I of Scotland
GrandFather: William "Nithsdale" Douglas 6 x Great Grand Son of King David I of Scotland
Mother: Egidia "Fair Maid of Nithsdale" Douglas Countess Orkney Grand Daughter of King Robert II of Scotland
Great x 4 Grandfather: Alexander Stewart 4th High Steward 2 x Great Grand Son of King David I of Scotland
Great x 3 Grandfather: James Stewart 5th High Steward 3 x Great Grand Son of King David I of Scotland
Great x 2 Grandfather: Walter Stewart 6th High Steward 4 x Great Grand Son of King David I of Scotland
Great x 4 Grandfather: Walter Burgh 1st Earl of Ulster 
8 x Great Grand Son of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 3 Grandmother: Egidia Burgh 9 x Great Grand Daughter of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Great x 4 Grandmother: Aveline Fitzjohn Countess Ulster 8 x Great Grand Daughter of Hugh I King of the Franks
Great x 1 Grandfather: King Robert II of Scotland 
Grand Son of King Robert the Bruce I of Scotland
Great x 4 Grandfather: Robert Bruce Earl Carrick 3 x Great Grand Son of King David I of Scotland
Great x 3 Grandfather: King Robert the Bruce I of Scotland 4 x Great Grand Son of King David I of Scotland
Great x 4 Grandmother: Marjorie Carrick 3rd Countess Carrick 3 x Great Grand Daughter of King David I of Scotland
Great x 2 Grandmother: Marjorie Bruce Daughter of King Robert the Bruce I of Scotland
Great x 4 Grandfather: Donald Mar 7th Earl of Mar
Great x 3 Grandmother: Isabella Mar Great Grand Daughter of King John of England
Great x 4 Grandmother: Elen ferch Llewellyn Aberffraw Countess Huntingdon and Mar Grand Daughter of King John of England
GrandMother: Princess Egidia Stewart Daughter of King Robert II of Scotland
Great x 3 Grandfather: William Earl of Ross
Great x 2 Grandfather: Hugh 4th Earl Ross
Great x 1 Grandmother: Euphemia Ross Queen Consort Scotland
Great x 3 Grandfather: John Graham of Abercorn 
Great x 2 Grandmother: Margaret Graham Countess Ross