33. According to historical sources, the Ubii moved in 39/38 or 19/18 BC under the governorship of Agrippa from the east to the west bank of the Rhine and settled in the Cologne hinterland. Cf. Eck 2004, 46-55. However, this is undoubtedly a highly simplified representation of events. As with the Batavi, we should think in terms of a new ethnogenesis resulting from a blending of the dominant migrant group (Ubii) with residual native groups.