St Trinian's Church is the roofless ruin of a small chapel at the foot of Greeba Mountain, adjacent to the main A1 Douglas - Peel Road in the parish of Marown, Isle of Man. Referred to in the Manx language as a "Keeil Brisht", the church is the source of an ancient Manx folk tale concerning the Buggane, a huge mythical ogre who lived on Greeba Mountain and who vowed that the church should never be completed.