The mythology of the modern-day Netherlands, Belgium and Luxembourg has its roots in the mythologies of pre-Christian (e.g. Gaulish (Gallo-Roman) and Germanic) cultures, predating the region's Christianization under the influence of the Franks in the Early Middle Ages. At the time of the Roman Empire and in the Early Middle Ages, some of the resident peoples of the Low Countries' included: Germanic tribes north of the Rhine River (with a lot of exceptions like the Eburones or the Celtic Nervii,...) Low Franconians Frisii (and later, in the same area, the Frisians) Tubanti Canninefates Batavians the decidedly more Celtic and Gallo-Roman Belgae tribes of Gallia Belgica south of the Rhine (also mainly but with many exceptions). Old Dutch mythology can mean the myths specifically told in Old Dutch language. However, many of the myths in this language are ancient and part of larger movements across Europe, such as Roman mythology that spread through the Roman Empire, and Continental Germanic mythology. Pre-Christian traditions of the veneration of trees (particularly the oak, see Donar's oak), springs and woods native to the Low Countries survived in Christianized guise into the Middle Ages. Sources for the reconstruction of pre-Christian traditions include the accounts of the Anglo-Saxon missionaries to the region, medieval and modern folklore and legend, and local toponymy. Pre-Christian traditions Deities From ancient regional mythology, most names of ancient gods and goddesses in this region come from local tribal lore, particularly in the North. Many of the deities are the same as eastern Germanic Deities: Wodan is Dutch for Odin, the god of war and leader of the Wild Hunt. The Wild Hunt was retold in Dutch with Wodan leading under different guises: Gait with his dogs; Derk with his dogs; Derk with his boar; the glowing horse; Henske with his dogs.). Donar is Dutch for Thor, the god of thunder. In Dutch the days of the week are named for Germanic gods, a custom derived from parallel Roman practice. Note that the following days were named through Roman influence, because the Romans found them to be (roughly) equivalent to their Roman deities: maandag (Monday) named after Máni - compared to "dies Lunae" (Luna's day) dinsdag (Tuesday) named after Tyr - compared to "dies Martis" (Mars' day) woensdag (Wednesday) after Wodan - compared to "dies Mercurii" (Mercury's day) donderdag (Thursday) is named after Donar - compared to "dies Jovis" (Jupiter's day) vrijdag (Friday) after