In ancient times, the Black Forest was known as Abnoba mons, after the Celtic deity, Abnoba. In Roman times (Late Antiquity), it was given the name Silva Marciana (Marcynian Forest, from the Germanic word marka = border). The Black Forest probably represented the border area of the Marcomanni (border people) who were settled east of the Roman limes. They, in turn, were part of the Germanic tribe of Suebi, who subsequently gave their name to the historic state of Swabia. With the exception of Roman settlements on the perimeter (e.g. the baths in Badenweiler, and mines near Badenweiler and Sulzburg) and the construction of the Roman road of Kinzigtalstraße, the colonization of the Black Forest was not carried out by the Romans, but by the Alemanni. They settled and first colonized the valleys, crossing the old settlement boundary, the so-called red sandstone border, for example, from the region of Baar. Soon afterwards, increasingly higher areas and adjacent forests were colonized, so that by the end of the 10th century, the first settlements could be found in the red (bunter) sandstone region. These include, for example, Rötenbach, which was first mentioned in 819.