Constantine’s Bridge on the Danube River, the largest river bridge in ancient times, was a bridge in the Roman Empire  which connected the major city of Ulpia Oescus (today’s Gigen in Northern Bulgaria) in the Moesia Superior province with Sucidava … Continue reading Constantine’s Bridge on Danube River at Roman Cities Ulpia Oescus (Gigen, Bulgaria) – Sucidava (Corabia, Romania)