The knot is attested by Tacitus in his 1st century AD work Germania, found on contemporary depictions of Germanic peoples, their art, and bog bodies.
Roman historian Tacitus reports in Germania (98 CE) that the Suebian warriors combed their hair back or sideways and tied it into a knot, allegedly with the purpose of appearing taller and more awe-inspiring on the battlefield.
Tacitus also reports that the fashion had spread to neighboring Germanic tribes among the younger warriors, while among the Suebians, the knot was sported even by old men as a status symbol, which "distinguishes the freeman from the slave", with the most artful knots worn by the most wealthy nobles:[1] Now I must treat of the Suebi, in whom are comprised not one tribe only, as with the Chatti and the Tencteri; for they occupy the greater part of Germany, and are also distinguished by special national names, though styled in general Suebi.
Experimental archaeological tests with this hairstyle showed that the Suebian knot holds just as well even with very long and thin hair, as in the bog body.
Historical depictions are found on the Trajan column, the cauldron of Musov, the Tropaeum Traiani relief, and a bronze sculpture of a kneeling German in the Bibliothèque nationale de France.