Manchan of Mohill, (fl. AD 464–538), was an early Christian saint credited with founding many early Christian churches in Ireland. His life is obscured because many people named Manchan are found among the monastically-inclined Medieval Irish Christians, and the name is a diminutive of Irish: Manach Latin: Monachus, a monk. Manchan probably died of famine during volcanic winters caused by the extreme weather events of 535–536, which preceded the 6th century Justinian plague of Mohill.