The original wooden structure from the foundation of the brothers Prokop and Felix Sieprski was erected after the epidemic in 1483 at the place of the apparition of the Blessed Virgin Mary to the reverend Andrzej of Sierpc. Already in 1513 the building was burned down. In its place a Gothic brick church was erected. In 1620 Zofia Potulicka’s efforts, the owner of the part of Sierpc, brought 6 Benedictines from Chełmno, for which a monastery was erected next to the church. In 1655 the Swedish squad robbed the church and the monastery. In 1794, in the fire the church lost its roof and interior decoration. In the years 1965-1975 a thorough renovation of the church was carried out.
The church has a rectangular nave and a narrower chancel ended with a straight wall. The nave received four bays, while the chancel received four bays, all covered with a wooden ceiling (the presbytery originally had a vault). On the north side a two-bay sacristy with a cross vault and a treasury were added to the chancel. By the southern facade of the chancel in 1566 a tomb chapel was added, and by the nave, from the south side, a porch was added.
The windows of the church are closed semicircularly. The main entrance to the church from the west is decorated with a Gothic portal moulded with a shaped bricks. The side gables of the church were topped with pillars passing into the pinnacles, between which three levels of plastered blendes were placed. In the main altar there is a sculpture of the Virgin Mary with the Child dated to the mid-fourteenth century.
Kunkel R.M., Architektura gotycka na Mazowszu, Warszawa 2005.
Żabicki J., Leksykon zabytków architektury Mazowsza i Podlasia, Warszawa 2010.
Website wikipedia.org, Kościół Wniebowzięcia Najświętszej Marii Panny w Sierpcu.