Laigin

The Laigin, modern spelling Laighin (Irish pronunciation: [ˈl̪ˠəinʲ]), were a Gaelic population group of early Ireland. They gave their name to the Kingdom of Leinster, which in the medieval era was known in Irish as Cóiced Laigen, meaning "Fifth/province of the Leinstermen" (Modern Irish Cúige Laighean), where their descendants ruled till the 17th century. Their territory, located in south-east Ireland, is thought to have once extended from the River Shannon to the River Boyne. The surnames of those descended from the Laigin are still counted amongst the most numerous in Ireland.