Sibyl Marshal 
Sibyl was born about 1215 in Lenton, Lincolnshire, England. She died after October 1250.General Notes
Sibyl (died in or after Oct 1250), daughter(?) of John Marshal, of Lenton. [Burke's Peerage]
I am not sure that the John Marshal who married Aline de Rye was of Lenton, but many World Connect sources state that he was the father. His grandmother was named Sibyl (Sibilla) de Salisbury.
Sibyl and William III de were married in a religious ceremony in 1st wife. They had a daughter named Agnes de.
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