number of deities, saying that the most worshiped god is Mercury, followed by Hercules, and Mars; he also mentions Isis, Odysseus, and Laertes. Scholars generally interpret Mercury as meaning Odin, Herculus as meaning Thor, and Mars as meaning Tyr. As these names are only attested much later, however, there is some doubt about these identifications and it has been suggested that the gods Tacitus names were not worshiped by all Germanic peoples or that he has transferred information about the Gauls to the Germans. The Germani themselves also worshiped gods with Roman names at votive altars constructed according to Roman tradition; while isolated instances of Germanic bynames (such as "Mars Thingsus") indicate that a Germanic god was meant, often it is not possible to know if the Roman god or a Germanic equivalent is meant. Most surviving dedications are to Mercury. Female deities, on the other hand, were not given Roman names. Additionally, the Germanic speakers also translated Roman gods' names into their own languages () most prominently in the Germanic days of the week. Usually the translation of the days of the week is dated to the 3rd or 4th century CE; however, they are not attested until the early Middle Ages. This late attestation causes some scholars to question the usefulness of the days of the week for reconstructing early Germanic religion. Alcis Tacitus mentions a divine pair of twins called the Alcis worshipped by the Naharvali, whom he compares to the Roman twin horsemen Castor and Pollux. These twins can be associated with the Indo-European myth of the divine twin horsemen (Dioscuri) attested in various Indo-European cultures. Among later Germanic peoples, twin founding figures such as Hengist and Horsa allude to the motif of the divine twins; Hengist and Horsa's names both mean "horse", strengthening the connection. In Scandinavia, images of divine twins are attested from 15th century BCE until the 8th century CE, after which they disappear, apparently as a result of religious change. Norse texts contain no identifiable divine twins, though scholars have looked for parallels among gods and heroes. Nerthus In Germania, Tacitus mentions that the Lombards and Suebi venerated a goddess, Nerthus, and describes the rites of the goddess in some detail. At their center is a ceremonial wagon procession. Nerthus's cart is found on an unspecified island in the "ocean", where it is kept in a sacred grove and draped in white