Thomas , 1st Earl of Derby Stanley 
Thomas , 1st Earl of Derby was born about 1435.1 He died on July 29th, 1504.1 General Notes
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Thomas , 1st Earl of Derby and Margaret , Countess of Richmond were married in a religious ceremony before 1473.2
1 Directory of Royal Genealogical Data
2 Encyclopædia Britannica CD '97 @ MARGARET BEAUFORT
Further sources/citations:
Dormant, Abeyant, Forfeited, and Extinct Peerages @ p. 503, Stanley, Barons Stanley, Dormant, Abeyant, Forfeited, and Extinct Peerages @ p. 395, Nevill, Earls of Salisbury, Earl of Warwick
2 Encyclopædia Britannica CD '97 @ MARGARET BEAUFORT
Further sources/citations:
Dormant, Abeyant, Forfeited, and Extinct Peerages @ p. 503, Stanley, Barons Stanley, Dormant, Abeyant, Forfeited, and Extinct Peerages @ p. 395, Nevill, Earls of Salisbury, Earl of Warwick
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