The first wooden church in Senoja Žagare, on the left bank of Švėtė, was built in 1499. in 1523 widowed landlady Marija Sirevičienė, in accordance with her husband's will, donated land to the church. She also funded the construction of a new church. According to Motiejs Valančius, the wooden church of Senosios Žagarė burned down in 1605. and a new one was soon built. The old Žagarė church until 1712. were wooden. After 1712 the current brick church was built from bricks and local limestone after a fire. Then Senoji Žagarė belonged to Kazimierus Umiastauskis. The hill on which the church stood belonged to the manor. This speaks of close ties between the manor and the church.
in 1786 the cemetery was moved from the church hill (there used to be an alcove here) to the Veide hill. During the French period (1812), the church archive burned, and the detailed history of the church disappeared.
The church of Old Žagarė is a rather restrained, monumental Renaissance form. The wooden, baroque-style processional altar, pulpit, and altar have artistic value. They illustrate the development of Baroque in Lithuania. Contemporary painting or repainting on the walls of the presbytery of St. Peter and St. Images of Paul. The church is primarily valuable for its authentic architecture.