Career
A 17th-century marginal note to copy of Vincent"s Baronage at College of Heralds alleged that she had had an affair with her father-in-law, Sir John Seymour. However, there is no contemporary evidence to support this. Catherine Fillol may have gone to a local convent, as this seems to be implied by a remark in her father"s will.
The will was challenged by Sir Edward Seymour in 1531, on the basis that his father-in-law was not of sound mind.
Catherine Fillol had two sons, John Seymour (buried 19 December 1552), who died unmarried and without issue, and Edward Seymour. With the death of Algernon, the seventh duke of Somerset in 1750, the Seymour Baronets of Berry Pomeroy Castle, inherited the title of Duke of Somerset.
Consequently, the present Duke of Somerset is descended from Catherine Filliol.