St Mary's Cathedral, Tallinn (Estonian: Toomkirik, full name: Tallinna Neitsi Maarja Piiskoplik Toomkirik, German: Ritter- und Domkirche, English: The Cathedral of Saint Mary the Virgin in Tallinn, also known as Dome Church) is a cathedral church located on Toompea Hill in Tallinn, Estonia. Originally established by Danes in the 13th century, it is the oldest church in Tallinn and mainland Estonia.