Cruachan (kroo-a-khawn) is a celtic and black metal band from Dublin, Ireland that has been active since the 1990s. They have been acclaimed as having "gone the greatest lengths of anyone in their attempts to expand" the genre of folk metal. They are recognised as one of the founders of the genre of folk metal. With a specific focus on celtic music and the use of Celtic mythology in their lyrics, Cruachan's style of folk metal is known as Celtic metal. The band named themselves after the archaeological site of Rathcroghan in Ireland also known as Cruachan.