 In 1173 the Hohenstaufen Emperor Frederick Barbarossa enfeoffed the Bavarian noble House of Andechs, who attached Istria to their Duchy of Merania.Aquileia regained Istria in 1209, when the Andechs margraves were banned due to alleged entanglement in the assassination of the German king, Frederick Barbarossa's son Philip of Swabia.By mid-century most of the Istrian coast had been conquered by Venice.