Church of St. John and the Five Brothers Martyrs together with the Bernardine monastery was founded in 1514 by Jan Lubrański and his brother Nicholas, owners of Kazimierz Biskupi. It was to be a place of worship of saints, whose relics, thanks to the efforts of the bishop, were able to bring in 1536. The church was built in 1518, and the construction of the monastery ended around 1520. Initially, the buildings were wooden, but soon the monastery buildings were converted into brick. In the years 1621-1624 elongated northern wing was extended, unfortunately soon the period of the Swedish Deluge wars led to the destruction of the complex. It was rebuilt in the second half of the 17th century. Also, new cloisters and a gate tower, which also served as a belfry, were built at that time. In 1898 the monastery was closed by the tsarist authorities, but already in 1921, the present hosts, Missionaries of the Holy Family, arrived to this site. During World War II, a camp for Polish priests formed by the Germans was located here.
Gothic church of Saint John is a one-nave building, with a slightly narrower, three-side ended chancel. Its nave and chancel are covered with stellar vaults. The gothic monastery adjoining the church was erected on the horseshoe plan from the north. Its buildings marked inside a small square patio. In the two rooms of the east wing, the sacristy and the former treasury, the gothic stellar vaults have been preserved. In turn, in the cloisters, two late-gothic portals survived: a wooden one from 1520 and a stone one from 1508.
Nowadays, the buildings are occupied by the Higher Theological Seminary and a small missionary museum, housing ethnographic and nature collections.
Webpage regionwielkopolska.pl, Kościół klasztorny Misjonarzy Świętej Rodziny pw. św. Jana Chrzciciela i Pięciu Braci Męczenników w Kazimierzu Biskupim.