Among the Byzantine authors, the Gothic author Jordanes in his work "Getica" (written in 550 or 551 AD) describes the Veneti as a "populous nation" whose dwellings begin at the sources of the Vistula and occupy "a great expanse of land". He describes them as the ancestors of the Sclaveni (a people who appeared on the Byzantine frontier in the early 6th century and who were the early South Slavs) and of the Antes (East Slavs). Specifically, he states that the Sclaveni and the Antes used to be called the Veneti, but are now "chiefly" (though, by implication, not exclusively) called Sclaveni and Antes. He places the Sclaveni north of a line from the Dniestr to Lake Musianus, the location of which is unclear, but which has been variously identified with Lake Constance, the Tisa–Danube marshes or the Danube delta. He also places the Antes to the east of the Sclaveni.