The Druid Theatre Company, founded in Galway in 1975, was the first Irish professional theatre company to be established outside Dublin. It has led the way in the development of Irish theatre in the ensuing years and is generally credited (along with Macnas, and the Galway Arts Festival) with making Galway one of the premier cultural centres in Ireland.
Druid Theatre Company website (http://www.druidtheatre.com)