WILLIAM 1st LORD de GRANDISON & SIBYL de TREZOG 
WILLIAM 1st LORD and SIBYL were married in a religious ceremony about 1285 in Donyatt, Somersetshire, England.1 They had a son and three daughters, named PETER (Piers) BARON, AGNES, MABILIA and CATHERINE.
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Personal Details
WILLIAM 1st LORD de GRANDISON
WILLIAM 1st LORD was born about 1255 in Cassington, Oxfordshire, England.1 He died on June 27th, 1335.1
SIBYL de TREZOG
SIBYL was born in 1270 in Eways, Herefordshire, England.1 She died at the age of 64 on October 12th, 1334.1
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Children
PETER (Piers) BARON de GRANDISON
PETER (Piers) BARON was born in 1286 in Ashperton, Herefordshire, England.1 He died at the age of 72 on August 10th, 1358.1
CATHERINE de GRANDISON
CATHERINE was born in 1304.1 She died at the age of 45 on November 23rd, 1349.1
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