The Battle of Alexander at Issus (German: Alexanderschlacht) is a 1529 oil painting by the German artist Albrecht Altdorfer (c. 1480–1538), a pioneer of landscape art and a founding member of the Danube school. It portrays the 333 BC Battle of Issus, in which Alexander the Great secured a decisive victory over Darius III of Persia and gained crucial leverage in his campaign against the Persian Empire. The painting is widely regarded as Altdorfer's masterpiece, and is one of the most famous examples of the type of Renaissance landscape painting known as the world landscape, which here reaches an unprecedented grandeur.