Paternal Family Tree: Byron
Around 1412 Margaret Byron was born to John Byron [aged 41].
In 1429 [her son] William Atherton was born to William Atherton [aged 24] and Margaret Byron [aged 17] at Atherton, Lancashire.
Around 1438 [her son] Nicholas Atherton was born to William Atherton [aged 33] and Margaret Byron [aged 26] at Atherton, Lancashire.
Before 1440 Robert Harcourt [aged 29] and Margaret Byron [aged 27] were married.
Around 1440 [her son] John Harcourt was born to [her husband] Robert Harcourt [aged 29] and Margaret Byron [aged 28] at Stanton Harcourt, Oxfordshire [Map]. He married Anne Norreys and had issue.
Before 1442 [her brother-in-law] Walter Blount 1st Baron Mountjoy [aged 25] and [her sister] Helena Byron Baroness Mountjoy [aged 25] were married.
Around 1443 [her son] Robert Harcourt was born to [her husband] Robert Harcourt [aged 32] and Margaret Byron [aged 31] at Stanton Harcourt, Oxfordshire [Map].
Around 1445 [her son] Thomas Harcourt was born to [her husband] Robert Harcourt [aged 34] and Margaret Byron [aged 33] at Stanton Harcourt, Oxfordshire [Map].
Around 1447 [her son] George Harcourt was born to [her husband] Robert Harcourt [aged 36] and Margaret Byron [aged 35] at Stanton Harcourt, Oxfordshire [Map].
In 1465 [her father] John Byron [aged 94] died at Clayton.
On 20th June 1465 [her brother-in-law] Walter Blount 1st Baron Mountjoy [aged 49] was created 1st Baron Mountjoy. [her sister] Helena Byron Baroness Mountjoy [aged 49] by marriage Baroness Mountjoy.
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In 1468 [her sister] Helena Byron Baroness Mountjoy [aged 52] died.
On 14th November 1470 [her husband] Robert Harcourt [aged 60] was killed by an adherent of the Staffords with whom he had a long running feud for Robert having murdered Robert Stafford in 1448 at Stanton Harcourt, Oxfordshire [Map].
Monumental Effigies. [her former husband] Sir Robert Harcourt KG (died 1471) and Margaret (Byron) [aged 59] his wife in Stanton Harcourt Church, Oxfordshire.
Robert Harcourt: On 20th September 1410 he was born to Thomas Harcourt at Stanton Harcourt, Oxfordshire [Map]. Before 1440 Robert Harcourt and Margaret Byron were married. On 14th November 1470 Robert Harcourt was killed by an adherent of the Staffords with whom he had a long running feud for Robert having murdered Robert Stafford in 1448 at Stanton Harcourt, Oxfordshire [Map].
On 26th June 1485 [her son] John Harcourt [aged 45] died.
On 25th May 1486 Margaret Byron [aged 74] died at Stanton Harcourt, Oxfordshire [Map]. She was buried at Stanton Harcourt, Oxfordshire [Map].
[her daughter] Joan Harcourt was born to Robert Harcourt and Margaret Byron.
[her daughter] Agnes Harcourt was born to Robert Harcourt and Margaret Byron. She married William Cope.
[her daughter] Elizabeth Harcourt was born to Robert Harcourt and Margaret Byron.
[her daughter] Margaret Harcourt was born to Robert Harcourt and Margaret Byron.
William Atherton and Margaret Byron were married.
Maurice Berkeley and Margaret Byron were married. The difference in their ages was 28 years; she, unusually, being older than him.
Great x 3 Grandfather: John Byron 
Great x 2 Grandfather: Richard Byron of Clayton
Great x 1 Grandfather: James Byron
Grandfather: Richard Byron
father: John Byron