From Wikipedia:
St. Mark's Church (Croatian: Crkva sv. Marka) is the parish church of old Zagreb.
The Romanesque window found in its south facade is the best evidence that the church must have been built as early as the 13th century as is also the semicircular groundplan of St. Mary's chapel (later altered).
In the second half of the 14th century the church was radically reconstructed. It was then turned into a late Gothic church of the three-nave type.
