The medieval rotunda in Grzegorzowice was once dated to the end of the 11th century, but newer research has changed the period of its construction to the second half of the 13th, and even to the beginning of the 14th century. In the oldest known source record from 1334-1336, included in the papal tithing register, it was referred to as “ecclesia nova”, hence the supposition that it was built shortly before that date. According to the chronicler Jan Długosz, the founder of the church was Nawój of the Topór coat of arms.
Before 1627, the nave was added to the rotunda, and in 1633 the consecration was made. In 1845, church was already in such bad condition that it was planned to be completely renovated. These intentions were not realized, which in 1851 led to the collapse of the roof and the closure of the church for the congregation. In 1854 the temple was rebuilt and a sacristy was erected next to it. In 1932, another thorough restaurant was carried out, combined with the display of the romanesque walls and the reconstruction of the tracery of the apse window.
The rotunda was built of an unworked stone, on a circular plan with a semicircular apse from the east. In the apse there was a round window with a quatrefoil Gothic tracery. On the south side, in the nave of the rotunda, there were two late-Romanesque semi-circular windows.
Currently, the medieval rotunda is the presbytery, eastern part of the early modern church of St. John the Baptist, it is therefore covered from the west by a four-sided nave and from the north by a sacristy. Inside the church there is a stone baptismal font from the 14th century.