An "aisling" is a type of Irish poetry that emerged in the 17th and 18th centuries. It typically features a dream vision where a poet encounters a beautiful woman, often representing Ireland or the nation. This woman usually embodies the ideals of freedom and beauty, symbolizing the hopes and aspirations of the Irish people during times of political struggle. In an aisling, the poet often reflects on themes of love, loss, and national identity. The form is characterized by its lyrical quality and rich imagery, making it a significant part of Irish literature. Notable poets associated with this genre include Aodhagán Ó Rathaille and Brian Merriman.