The Vistula Veneti, also called Baltic Veneti, Venedi or Venethi, were an Indo-European people that inhabited the lands of central Europe east of the Vistula River and the Bay of Gdańsk. Ancient Roman geographers first mentioned Venedi in the 1st century AD, differentiating a group of peoples whose manner and language differed from those of the neighbouring Germanic and Sarmatian tribes. In the 6th century AD, Byzantine historians described the Veneti as the ancestors of the Slavs who, during the second phase of the Migration Period, crossed the northern frontiers of the Byzantine Empire.