Zagreb Cathedral was formerly known as St. Stephen’s Cathedral. Today, the Cathedral of the Assumption of the Blessed Virgin Mary is dedicated to the Assumption of Mary and to kings Saint Stephen and Saint Ladislaus.
Once you get to Kaptol Square you will see it is dominated by Zagreb cathedral which has been there since the 11th century.
The Archbishop’s Palace encloses it from three sides, and because of its twin 108 meters (354 ft) high spires, it is the tallest building in Croatia. It literally soars over the city. The Zagreb Cathedral must be seen and its sacristy is of great architectural value.
What you will see today does not represent the original construction. The first Cathedral was damaged during the Tartar attack and a great fire in the 13th century.
Finally, it was severely damaged by the 1880 earthquake and was restored in the Neo-Gothic style by Hermann Bollé, the cathedral you see today.
https://www.visitzagreb.hr/zagreb/zagreb-cathedral/