When it was built in the 13th century it was constructed in the Romanesque style. However, only a window in the south wall and the bell-tower foundation remain from that period. In the 14th century, the church was almost rebuilt in the Gothic style with Gothic arches and a shrine. But the most magnificent addition was the luxurious Gothic south portal, which is considered one of the most beautiful in Croatia.

On the northwest wall of the church, you will see the oldest coat of arms of Zagreb, engraved ‘1499’, although the original is now housed in the Zagreb City Museum. One of the church's most eye-catching features is its colourful mosaic roof, which was created during a restoration project led by Viennese Gothic church restorer Friedrich von Schmidt and his collaborator, architect Hermann Bollé, between 1876 and 1882.