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Nikopol, town, northern Bulgaria. It lies along the Danube River near its confluence with the OsÅ­m (Ossăm) and opposite Turnu Măgurele, Rom. Nikopol was an important Danubian stronghold—ruined fortresses still dominate the town—founded by the Byzantine emperor Heraclius I in ad 629. In 1396 the Ottoman sultan Bayezid I defeated a Crusader army led by King Sigismund of Hungary at Nikopol, an event that contributed significantly to Turkish domination of the Balkans for five centuries....