GM. Thank you for your reply. It has been rebuild many times after the conflict with Barcelona. Besalu was one of the small Catalan Countries during 10th-12th century and there was a short war with Barcelona. It was blown up during the Spanish Civil War (1936-1939) and rebuilt in the 1950s-1960s. After that it has few minor repairs.

Here you can find more details: https://www.turismoencatalunya.es/en/medieval-bridge-Besalu.html