An Irminsul was a sacred, pillar-like object attested as playing an important role in the Germanic paganism of the Saxons. Medieval sources describe how an Irminsul was destroyed by Charlemagne during the Saxon Wars. A church was erected on its place in 783 and blessed by Pope Leo III. Sacred trees and sacred groves were widely venerated by the Germanic peoples, and the oldest chronicle describing an Irminsul refers to it as a tree trunk erected in the open air.

Germanic paganism or Germanic religion refers to the traditional, culturally significant religion of the Germanic peoples. With a chronological range of at least one thousand years in an area covering Scandinavia, the British Isles, modern Germany, and at times other parts of Europe, the beliefs and practices of Germanic paganism varied. Scholars typically assume some degree of continuity between Roman-era beliefs and those found in Norse paganism, as well as between Germanic religion and reconstructed Indo-European religion and post-conversion folklore, though the precise degree and details of this continuity are subjects of debate. Germanic religion was influenced by neighboring cultures, including that of the Celts, the Romans, and, later, by the Christian religion. Very few sources exist that were written by pagan adherents themselves; instead, most were written by outsiders and can thus present problems for reconstructing authentic Germanic beliefs and practices.