Derry city walls
Derry's walls, also known as the Walls of Derry, were originally built by the Irish Society between 1613 and 1619, under the supervision of the London builder and architect Peter Benson. They were built with the intention of protecting the Scottish and English planters that had moved to Ulster as part of the Plantation of Ulster that had been established by James I. It was a direct consequence of the previous settlement being destroyed by Irish chieftain Cahir O'Doherty during O'Doherty's rebellion.