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According to Constantine Porphyrogenitus's  De Administrando Imperio ( 950), Ragusa was founded in the 7th century, named for a "rocky island" called Lausa, by refugees from Epidaurum (Ragusa Vecchia), a Greek city situated some 15 km to the south, when that city was destroyed in the Slavic incursions.

Excavations in 2007 revealed  a Byzantine basilica from the 8th century and parts of the city walls.

The size of the old basilica clearly indicates that there was quite a large settlement at the time.

There is also evidence for the presence of a settlement in the pre-Christian era.

Antun Ničetić, in his 1996 book  (), expounds the theory that Dubrovnik was established by Greek sailors, as a station halfway between the two  Greek settlements of Budva and Korčula,  apart from each other.