Church of the Assumption in Siemiatycze

On the chancel vault you can still see the Lis (Fox) coat of arms of the Sapieha family, who built this church in the 17th century. The Church of the Assumption of the Virgin Mary in Siemiatycze is the town's oldest and most valuable monument: a brick basilica built in 1626–1637 and remodelled in the 18th century by the Vincentian missionaries in late Baroque style. It stands at 3 Maja 2, surrounded by a wall with a bell tower and the buildings of the former monastery, and inside it holds Régence-style altars and a rare set of 18th-century confessionals.

History: the Sapiehas and the missionaries

The parish was founded in 1456 by Michał Kmita Sudymontowicz; the first church was most likely wooden. The present church was begun in 1626 by Lew Sapieha, Grand Chancellor and Grand Hetman of Lithuania, and completed in 1637 by his son Kazimierz Leon after his death. It was consecrated a year later. Originally it was a late Renaissance building.

In 1719 the parish was taken over by the Congregation of the Mission of St Vincent de Paul. The missionaries built a monastery designed by Karol Antoni Bay and Wincenty Rachetti, enclosed the site with a wall and bell towers, and in 1737 gave the façade its late Baroque form. After a fire in 1754 the aisle vaults were rebuilt. On 4 December 1793 King Stanisław August Poniatowski attended mass here. In 1832, in reprisal for the November Uprising against Russian rule, the Russian authorities dissolved the missionary house, and in 1863 a statue of St Michael the Archangel was placed on the gate in front of the façade. During the Second World War one of the two 18th-century bell towers was demolished.

What to see inside

• The chancel vault with late Renaissance stucco in the so-called Lublin style and cartouches bearing the Lis arms – a survival of the original church.
• The high altar in Régence style, designed by K.A. Bay and made around 1729–1730 by the workshop of Bartłomiej Bernatowicz, plus side altars from the same scheme.
• Oak confessionals from about 1744 with oval paintings on the theme of penance: St Peter, King David, the Prodigal Son.
• The organ case from the mid-18th century, enlarged in 1780 by the Lublin organ builder Stanisław Kędlarski.
• A late Gothic crucifix from around 1400 in the sacristy, associated with the earlier wooden church.

Did you know?

The missionaries commissioned six confessionals, which together formed a cycle about sin, repentance and forgiveness. Four remain in Siemiatycze; the other two, with paintings of Mary Magdalene and the Good Shepherd, were moved after 1907 to the church in nearby Dołubowo. Older literature attributed some of the paintings to Szymon Czechowicz, but this attribution is not confirmed. During the partitions of Poland the former monastery served, among other things, as a military hospital.

Tripto tip

Sunday masses: 8:00, 10:00, 12:00 and 18:00; weekdays 6:30, 7:00 and 18:00 (17:30 in May, June and October) – as of October 2026, according to the diocesan website. The best time to see the interior is just before or after mass; entry is free. The parish office is open on weekdays 17:00–17:45, tel. +48 85 655 24 02. Allow 30–40 minutes; start in the chancel, where the oldest stucco with the Sapieha arms is right above you. The visit combines easily with the Holy Mountain of Grabarka – the most important Orthodox shrine in Poland – with Drohiczyn on the Bug River, or with Mielnik and the Bug valley.