The Church of St. Michael is situated on Island of Koločep, dated in the 11th century. Some researchers believe the ktetor was
Queen Helen (Jelena) wife of King Zvonimir and sister of Hungarian King Ladislav. Today it is left in ruins.
Its a single nave building with three bays, probably with a dome and an apse that is semicircular inside and rectangular on the outside. Its facade was dissected by shallow blind niches. Side walls probably had lesenes connected by a series of blind arcades.
After collecting fragments all over the island, the altar screen was finally reconstructed showing, in relief, an image of Archangel Michael and a partially preserved inscription. Most researchers recognized Byzantine influence.