The parochial church of Ják village is the most complete Romanesque Church in Hungary. It was originally built as the church of a St. Benedictine Monastery. The village church at that time was a rotunda in front of the façade of the main doorway of the Ják church.
Both outside and inside the church is adorned with rich sculptures. The 3 naves and 3 apses are formed in a basilica structure. Columnar capitals are sculptured by plant and some animal ornamentation. The rotunda has been built with 4 apsis and 2 floors.