William de St. Omer
- Born: Brundale, Norfolk, England
- Marriage (1): Unknown
- Marriage (2): Petronilla de Lacy 1040,1179
- Died: After 1271, England
 General Notes:
Complete Peerage, Vol. XIIA, p. 771 and The New England Historical & Genealogical Register, Vol 140, p. 219 give this generation the name William de St. Omer. An Essay Towards a Topographical History of the County of Norfolk, Vol. III, p. 219 calls him Sir Thomas de St. Omer. 141,1040,1179
Information about this person:
• Background Information. 1040
William St. Omer held both the manors of Bramshaw and Brundale, and also various royal commissions from 1254 to 1271 ["Knight of Edward I," Harlein Society, 83(1931):191). He is thought ot have had an earlier wife, who was the mother to his heir Thomas: and before 1256 he married Parnel daughter of William de Lacy and widow of Ralph de Tony [Cokayne, Complete Peerage, 12.1:771]
~New England Historical & Genealogical Registry, Vol. 140, p. 2
• Background Information. 1179
"Sir Thomas, son and heir of Sir Thomas de St. Omer, married Petronilla, widow of Ralph Lord Tony: In 1275, he was a justice itinerant with Simon de Grey, in Cambridgeshire. In the preceding year he was sent with William de la Rivers into foreign parts, and had royal letters of protection, dated on the day next after Palm-Sunday, in March, with a clause to hold good to the feast of St. Peter ad vincula, ensuing; in the 15th of Edward I. he claimed, as lord, a yearly fair on the feast and morrow of St. Bartholomew, free warren, &c. as granted to his father. "
~An Essay Towards a Topographical History of the County of Norfolk, Vol. III, p. 219
William next married Petronilla de Lacy, daughter of Walter de Lacy Lord of Meath, Ireland and Margaret de Braose 1040.,1179 (Petronilla de Lacy was born about 1196 in Trim Castle, Meath, Ireland and died after 25 Nov 1288 in France 141.)
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