Mary's Church (Mariachurkan), the church was built in 1247 under the pious King Magnus Ladoulos, son of Jarl Birger. The former church of the Dominican monastery. The monastery was destroyed during the Reformation, and the church became a parish church. The only functioning of the ancient churches of Sigtuna (the rest are preserved in ruins.) The church houses the burial shields of many Swedish knights. The coats of arms of the Oxenstierna, Trollle, Hedda, Baner, Bunde, Vasa, and Ixkull clans are distinguishable. The Oxenstierna noble family (coat of arms with bull horns) owned Steninge Castle near Sigtuna. The benches are also marked with heraldic signs. A lot of medieval sculpture.Of the modern works, Brur Yurt's panel "Gethsemane Garden" (1944) attracts attention.

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