St. Triphon’s Cathedral is the most significant monument from medieval Kotor. The cathedral was under construction for decades. It was finally completed and consecrated in 1166, of which a written testimony is preserved. It was built on the old cultural place, in which in 809 a small pre-Roman church was built dedicated to the same saint. The foundations of the original church had the shape of a cross with three leaning apsids and the dome above the central part. Its patron was an inhabitant of Kotor - Andrea Saracenis, which is confirmed by the sarcophagus with his name.
The cathedral contains valuable examples of furnishings and works of art, in the church itself and in the treasury-reliquiarum. One side of the ciborium from the original church from the 9th century with a pre-Roman wattle (interlacing ornament) and lions is particularly rare. The newer, high ciborium originates from the second half of the 14th century and is probably the work of the apprentice of Fra. Vito Kotoranin. Lateral apsids have gothic sculptures – stone Pieta of Nordic origin and a wooden painted statue of Vinko Fererski. Four marble altars were made in Venice in the 18th century. A relief of the Virgin Mary with Christ and Saints was made by Deziderio Kotoranin in the baroque manner. There is also a masterpiece of Kotor’s medieval gold and silversmiths – silver and gold-plated pieces.
From the frescoes that decorated the entire church in the first half of the 14th century, so-called pictores graeci, only smaller fragments have been preserved – the Crucifixion and the Resurrection in the apsid, and around ten figures in the apex of the arches between the naves. As far as easel paintings, particularly important are the Crucifixion by Basan Stariji, double-sided icons with the Virgin Mary and Christ in the Tomb, attributed to Lovro Dobrićević, Sts. Vartolomej, Djordje and Antonin by Girolamo da Santacroce, Paying Homage to the Kings by Mihael Najdlinger and several other works by unknown artists.