The Amphitheatre of Serdica was built on top of an earlier Roman theatre, which was constructed in the 2nd or 3rd century AD.
As evidenced by coin and ceramic findings, including a rare bronze medallion of Antinous, the amphitheatre was constructed on top of the theatre ruins in two stages during the late 3rd and early 4th century AD, under Roman emperors Diocletian (r.