Aisling, or "Vision," is a genre of Irish literature that emerged in the late 17th and early 18th centuries. It typically features a dream or vision experienced by a poet, often involving a beautiful woman who symbolizes Ireland or a national ideal. The Aisling serves as a vehicle for expressing political and social themes, reflecting the struggles of the Irish people during times of oppression. The Aisling form is characterized by its use of allegory and rich imagery, often drawing on elements of mythology and folklore. Prominent poets associated with this genre include Aodhagán Ó Rathaille and Brian Merriman, who utilized the Aisling to convey messages of hope and resistance against colonial rule.