What is "drevlians"

The Drevlians (, ) were a tribe of Early East Slavs between the 6th and the 10th century, which inhabited the territories of Polesia and Right-bank Ukraine, west of the eastern Polans and along the lower reaches of the rivers Teteriv, Uzh, Ubort, and Stviga. To the west, the Drevlians' territories reached the Sluch River, where the Volynians (related to the territory of Volynia) and Buzhans (related to the name of Southern Bug river) lived. To the north, the Drevlians' neighbors were the Dregovichs.