The Picts were a confeeration of tribes in what later was to become central and northern Scotland from Roman times until the 10th century. They lived to the north of the Forth and Clyde. They are often assumed to have been the descendants of the Caledonii and other tribes named by Roman historians or found on the world map of Ptolemy, though the evidence for this connection is circumstantial and the issue of "Pict" origins remains controversial among historians. Pictland, also known as Pictavia, became the Kingdom of Alba also known as Albania, during the 10th century and the Picts became the Fir Alban, the men of Alba.