The cathedral of Vaison was built on the ruins of a Roman temple, the remains of which can be seen outside the chevet. More than one church has existed on this site; a 6th-century basilica was destroyed by Frankish invaders.
The present building dates primarily from the 11th and 12th centuries. After a dispute with the Count of Toulouse in the late 12th century, the medieval city of Vaison was mostly abandoned for the new town. Today, little remains of the extensive medieval city except for the cathedral.
The apse is the most interesting aspect of the interior. Behind a simple stone altar, on a lower level than the nave, is the medieval bishop's throne and three semicircular benches for the canons. In front of the throne is an old sarcophagus containing the relics of St. Quenin (d. 578). The apse also contains several tomb niches of various styles and some reliquaries and statues.
The cloister, dating primarily from the mid-12th century, is a peaceful space with a lush central garden. The canons' buildings, such as the refectory and dormitory, have disappeared and many of the capitals were restored in the 19th century, but the cloister retains its medieval appearance and atmosphere. Most of the capitals are carved with foliage and vines, but some have charming creatures and human faces.References:
The Kalozha church of Saints Boris and Gleb is the oldest extant structure in Hrodna. It is the only surviving monument of ancient Black Ruthenian architecture, distinguished from other Orthodox churches by prolific use of polychrome faceted stones of blue, green or red tint which could be arranged to form crosses or other figures on the wall.
The church is a cross-domed building supported by six circular pillars. The outside is articulated with projecting pilasters, which have rounded corners, as does the building itself. The ante-nave contains the choir loft, accessed by a narrow gradatory in the western wall. Two other stairs were discovered in the walls of the side apses; their purpose is not clear. The floor is lined with ceramic tiles forming decorative patterns. The interior was lined with innumerable built-in pitchers, which usually serve in Eastern Orthodox churches as resonators but in this case were scored to produce decorative effects. For this reason, the central nave has never been painted.
The church was built before 1183 and survived intact, depicted in the 1840s by Michał Kulesza, until 1853, when the south wall collapsed, due to its perilous location on the high bank of the Neman. During restoration works, some fragments of 12th-century frescoes were discovered in the apses. Remains of four other churches in the same style, decorated with pitchers and coloured stones instead of frescoes, were discovered in Hrodna and Vaŭkavysk. They all date back to the turn of the 13th century, as do remains of the first stone palace in the Old Hrodna Castle.
In 2004, the church was included in the Tentative List of UNESCO"s World Heritage Sites.