Petronilla de Lacy
- Born: Abt 1196, Trim Castle, Meath, Ireland
- Marriage (1): Ralph VI de Toeni Lord of Flamstead 141
- Marriage (2): William de St. Omer 1040,1179
- Died: After 25 Nov 1288, France 141
Information about this person:
• Background Information. 141 Ralph de Toeni the 5th, between Nov 1232 and 1234, Pernel, daughter of Walter de Lacy (elder brother of Hugh, Earl of Ulster), presumably by his wife Margaret, daughter of William de Briouze. He died about Michaelmas 1239 at sea. His widow, who was granted the custody of Maud Castle, 1247-20 Jun 1251 married, before 15 Oct 1256, Willian de St. Omer, and was living, 25 November 1288.
~Cokayne's Complete Peerage, 2nd Edition,(Tony), Vol. XIIA, p. 769-771
Petronilla married Ralph VI de Toeni Lord of Flamstead, son of Roger V de Toeni and Constance de Beaumont.141 (Ralph VI de Toeni Lord of Flamstead was born about 1189 in Flamstead, Hertfordshire, England and died on 29 Sep 1239 at Sea.)
Petronilla next married William de St. Omer, son of Sir Thomas St. Omer Knight and Unknown 1040.,1179 (William de St. Omer was born in Brundale, Norfolk, England and died after 1271 in England.)
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