The Church of St Andrew and St Peter the Elder in Zadar is an example of a double church, located near the city market, and functioning as two connected little churches. The southern side wall and the apse of the Church of St Andrew date back to the 5th century, while the Church of St Peter was built on the spot of former Roman buildings.
The Church of St Andrew is a single-nave church with frescoes from the 12th century, and behind its apse there is a double-nave Church of St Peter the Elder, initially used as an oratory. The oratory dates back to the 5th century, so apart from the oratory of the Zadar Cathedral, it represents the oldest discovered Early Christian cult building within the walls of Roman Zadar. In the Pre-Romanesque period, it was turned into a double-nave church.