Pont de Constantin le Grand

Constantine's Bridge (Latin: Pons per Danuvium Ductus; Bulgarian: Константинов мост, Konstantinov most; Romanian: Podul lui Constantin cel Mare) was a Roman bridge over the Danube used to reconquer Dacia. It was completed in 328 AD and remained in use for four decades. It was officially opened on 5 July 328 AD in the presence of emperor Constantine the Great. With an overall length of 2,434 metres, 1,137 metres of which spanned the Danube's riverbed, Constantine's Bridge was the longest ancient river bridge and one of the longest of all time. The bridge was constructed between Sucidava (present-day Corabia, Romania) and Oescus (modern Gigen, Bulgaria), during the reign of Constantine the Great. The construction was certainly inspired, in technique and dimensions, by the famous Trajan's bridge, built by Apollodorus of Damascus. The bridge proved to be essential in the transfer of troops, equipment and supplies north of the Danube for the implementation of the imperial strategy north of the river.

Constantine's Bridge is a historical Roman monument located over the Danube River between Corabia, Romania, and Gigen, Bulgaria. Constructed in 328 AD under Emperor Constantine the Great, it served as a strategic crossing for military operations north of the Danube. The site is currently inscribed as part of the UNESCO World Heritage Site 'Frontiers of the Roman Empire – Dacia'.