Analysis of the process of “interpretatio Romana” in sections 9.1 and 43.3 of the Germany of Tacitus. The Germanic gods are identified with those of the Greek-Roman pantheon and show Latin names. The main way for the understanding of foreign cultures in Tacitus is constituted by the comparison with his own culture, eliminating the language barrier, and seizing partial identity and partial opposition between the world of "self" and the world of "others", in an essentially universalist perspective as regards in particular the world of religion.