The Church of the Assumption of the Blessed Virgin Mary stands on the site of a large Romanesque Basilica. Its brickwork has been preserved in both towers. Between 1340 and 1370, the famous stonemason Peter Parler was involved in the reconstruction of the church. The main altar with a painting of the Assumption of the Virgin Mary dates back to the 17th century. The side chapel of John of Nepomuk was constructed between 1724 and 1728. Its asymmetric position is not accidental as it is connected with the inscription on the side of the church; according to one legend it was John of Nepomuk himself who scratched the inscription into the plaster when he studied at the local renowned Latin school. The connection with St John of Nepomuk made Žatec one of the leading places of the St John tradition. The facade of the church was rebuilt in the Baroque style between 1740 and 1741. The belfry was built by a builder from Žatec, Pavel Lochy, in 1770 - 1773. At the end of the 19th century the church was renovated in the then popular historicist style that, to a great extent, removed the medieval character of the church. Most statues around the church were made by the Žatech sculptor Jan Karel Vetter in 1728 - 1729 - in front of the church there are statues of St Mary Magdalene, St John of Nepomuk, St Peter, St Paul, St Norbert, St Immaculata, St Jude Thaddeus, St Francis of Assisi, and behind the church there are St Wenceslas and St Afra.