The Church of St. Peter is situated in Dubrovnik,East of the byzantine castle (Castello), and was probably built at the end of the 10th century and is the oldest cathedral in the city. The cathedral complex has not survived, and what has remained is the crypt that now lies underneath the Baroque Church of St. Catherine.
The oldest mention of the Church is in the document from 1386. By the 16th century the Church was altered, especially after the earthquake in 1667 when it was rebuilt and incorporated into the new Church of St. Catherine. During the 19th century the Church has undergone significant changes.
The Church was a three nave basilica with a transept and a dome, with an apse on the East side which is rectangular on the outside and semicircular on the inside, with a crypt bellow the apse and the nave. Some researchers assumed that the narthex on the West side was framed by bell towers. Therefore its an edifice with a strong Byzantine and Western (Romanesque) influence.
The facade was divided by shallow niches. Numerous stone church furnishing including capitals, pilasters, lintels, ciborium, altar screen, etc. has been found testifying the time of the construction.