The Annals of Ulster are annals of medieval Ireland. The entries span the years from AD 431 to AD 1540. The entries up to AD 1489 were compiled in the late 15th century by the scribe Ruaidhrí Ó Luinín, under his patron Cathal Óg Mac Maghnusa on the island of Belle Isle on Lough Erne in the province of Ulster. Later entries (up to AD 1540) were added by others.