Germania

"The Germans, like many other peoples, are said to have been visited by Hercules, and they sing of him as the foremost of all the heroes when they are about to engage in battle. Ulysses also, in all those fabled wanderings of his, is supposed by some to have reached the northern sea and visited German lands, and to have founded and named Asciburgium, a town on the Rhine inhabited to this day. They even add that an altar consecrated by Ulysses and inscribed also with the name of his father Laertes was discovered long ago at this same place, and that certain barrows with monuments upon them bearing Greek inscriptions still exist on the borders of Germany and Raetia. I do not intend to argue either for or against these assertions; each man must accept or reject them as he feels inclined."

"... the peoples of Germany have never contaminated themselves by intermarriage with foreigners but remain of pure blood, distinct and unlike any other nation. One result of this is that their physical characteristics, in so far as one can generalize about such a large population, are always the same: fierce-looking blue eyes..."

Tacitus - Germania