 Tacitus also mentioned the Suebi as a large grouping who included the Semnones, the Quadi and the Marcomanni, but he did not say precisely to which (if any) of the three nations they belonged.Pomponius Mela wrote in his "Description of the World" (III.3.31) in reference to the Kattegat and the waters surrounding the Danish isles (see the Codanus sinus)