Kilvert was born in Bernicia at the castle of Bamburgh. Kilvert married Ecgfrida, daughter of Bishop Aldhun (?), in the Kingdom of Bernicia. She divorced him & became a nun. He was a Thegn of Yorkshire.
- [S103] Clarence E. Pearsall, History of the Pearsall Family, Volume I: Chapter 11, section 3, pages 318-319.