Séamus mac Pilib Mac Mathghamhna Cleric
Séamus mac Pilib Mac Mathghamhna (died 1519) was the Bishop of Derry.He was appointed Bishop-designate of Clogher on the 5 November 1494. John Edmund de Courcy was also Bishop of Clogher around this time and he did not renounce his claim to Clogher until 1502. Séamus then became Bishop of Derry from 26 November 1503 up until his death in 1519.