Iar Connacht
Iar Chonnachta (longer form - Iarthar Chonnachta) (anglicised spelling- Iar Connaught) (meaning west of the Connachta, or western Connacht), was a region covering all of County Galway west of the river Corrib and Lough Corrib; Maigh Seola; and part of the barony of Ross in County Mayo.
Read more about Iar Connacht: Description, Kings of Maigh Seóla (later Uí Briúin Seóla), Kings of Iar Connacht, Taoiseach of Iar Connacht