July 5, 328
A Roman Empire bridge built across the river Danube made its formal debut. This opening of the bridge took place in the presence of Constantine I (also called Constantine the Great), who reigned as Roman emperor from 306 to 337. The structure, which has become known as Constantine’s Bridge, was constructed in the lower region of the Danube between the town and fortress of Sucidava (located in what is now the Romanian port town of Corabia) and the town of Oescus (near the present-day Bulgarian village of Gigen).
Constantine’s Bridge was designed by Roman architect Theophilus Patricius. Key architectural features of the wooden bridge included two abutment piers at each end. While no longer in existence, the bridge did achieve at least one lasting claim to fame. With an overall length of 7,995 feet (2,437 meters), it is widely considered to be the longest river bridge built in ancient times.
For more information on Constantine’s Bridge, please check out https://en.wikipedia.org/wiki/Constantine%27s_Bridge_(Danube).
Additional information on bridges built by the ancient Romans is available at https://en.wikipedia.org/wiki/Roman_bridge.