Monastery church of St. John the Baptist and John the Evangelist was built in the north-western corner of the Old Town, on the edge of a high slope of the Vistula. It was built in several stages between 1280 and 1330. At the end of the 13th century, circumferential walls were erected. Around 1310-1320, the lower church was vaulted, and around 1330 also the upper church was vaulted and gothic, western halfgables were built by the tower.
It is a brick, single-nave, four-span structure with a pentagonal ended chancel section. The church is buttressed, from the west there is a high gable topped with a turret from the beginning of the 17th century. The corpus is two-storey, thanks to the incorporation of a spacious, brick matroneum. The interior is covered with a stellar vault, a low part under a gallery – groin, supported on two pillars. In 1595, the burial chapel of nuns was added to the presbytery from the north, and from the south a chapel of Saint Michael.
Medieval equipment of the monastery church include brought from Flanders, a tombstone of the burgher of Arnold Lischoren who died in 1275. This is one of the oldest monuments of sculpture in Pomerania. Before the mid-fourteenth century, vault bosses were created, and in the mid-century wall paintings on the matroneum – the Song of Songs cycle, with iconography unique on a European scale. From the end of the 14th century comes the figure of Christ in a grave with moving arms.
The oldest element in the monastery is the so-called The Mestwin Tower, perhaps founded in the second quarter of the 13th century, as a Teutonic watchtower. To the church from the west adjoins the oldest, northern monastery wing, connecting with the Mestwin Tower. In the Middle Ages, also the west wing was built, adjacent to the north and east, not connected with the church. In the eastern section there is a tower, probably a former gate.
Webpage icimss.edu.pl, Chełmno Zespół klasztorny pocysterski, ob. SS. Miłosierdzia.
Webpage wikipedia.org, Zespół klasztorny Sióstr Miłosierdzia w Chełmnie.