Confederate Ireland
Lynch was the eldest of the 12 sons of Nicholas Lynch fitz Stephen (Mayor 1584–1585) and great-grandson of Mayor Arthur Lynch (died 1539). He was a land agent for Richard Burke, 4th Earl of Clanricarde; their surviving correspondence from c.1617 to c.1632 was published in 1996. He was a mentor to his stepson Patrick D'Arcy and his nephew Richard Martyn, later senior political figures of Confederate Ireland.