Tacitus, Germania. Chapter 32.
32. Next to the Chatti on the Rhine, which has now a well-defined channel, and serves as a boundary, dwell the Usipii and Tencteri. The latter, besides the more usual military distinctions, particularly excel in the organisation of cavalry, and the Chatti are not more famous for their foot-soldiers than are the Tencteri for thier horsemen. What thier forefathers originated, posterity maintain. This supplies sport to their children, rivalry to their youths; even the aged keep it up. Horses are bequeathed along with the slaves, the dwelling-house, and the usual rights of inheritance; they go to the son, not to the eldest, as does the other property, but to the most warlike and dangerous.
Tacitus, Germania - translated by Alfred Lord Church and William Jackson Brodribb.