The entrance to the Old Town is through the Land Gate (Kopnena vrata) at the south of the Old Town. The gate’s front is covered by a triumphal arch built in honour of commander Leonardo Foscolo, who was instrumental in the defence of Dalmatia during the 17th century.
https://www.visit-croatia.co.uk/croatia-destinations/croatian-islands/korcula/sightseeing-korcula/