On the lower Danube, which was given priority over the upper Danube, this required the annexation of Moesia. The Romans' target was thus the tribes which inhabited Moesia, namely (from west to east) the Triballi, Moesi and those Getae who dwelt south of the Danube. The Bastarnae were also a target because they had recently subjugated the Triballi, whose territory lay on the southern bank of the Danube between the tributary rivers "Utus" (Vit) and "Ciabrus" (Tsibritsa), with their chief town at Oescus (Gigen, Bulgaria). In addition, Augustus wanted to avenge the defeat of Gaius Antonius at Histria 32 years before and to recover the lost military standards. These were held in a powerful fortress called Genucla (Isaccea, near modern Tulcea, Romania, in the Danube Delta region), controlled by Zyraxes, the local Getan king. The man selected for the task was Marcus Licinius Crassus, grandson of Crassus the triumvir and an experienced general at 33 years of age, who was appointed proconsul of Macedonia in 29 BC.