Sir Robert I Tregoz 
General Notes
pg 222, "Ancestral Roots of Sixty Colonists etc" by Frederick Lewis Weiss, 6th Edition
pg 537, " A Genealogical History of the Dormant, Abeyant, Forfeited and Extinct Peerages of the British Empire" by Sir Bernard Burke, published 1883
‌Robert I and Sybilla were married in a religious ceremony in 1198.
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