an early name of Ireland that is now used in poetry
"The poet chose to address the landscape using the ancient name Erin, evoking a sense of timeless Irish heritage."
Ireland.
"She planned her summer vacation around visiting Erin to explore its historic castles and green landscapes."
The word Erin is an Anglicized form of the Irish name Éirinn. It originally referred to Ireland itself before becoming a poetic or literary term in English.