Ritual of oak and mistletoe
The ritual of oak and mistletoe is a Celtic religious ceremony, in which white-clad druids climbed a sacred oak, cut down the mistletoe growing on it, sacrificed two white bulls and used the mistletoe to make an elixir to cure infertility and the effects of poison. The ritual, known from a single passage in Pliny's "Natural History", has helped shape the image of the druid in the popular imagination. Account by Pliny the Elder. The only extant source for this ritual is a passage in the "Natural History" by Roman historian Pliny the  Elder, written in the 1st century AD. Speaking of mistletoe, he writes: While Pliny does not indicate the source on which he based this account, French archaeologist Jean-Louis Brunaux () has argued for Posidonius of Rhodes, a polymath who flourished in the 1st century BC. Later influence and historiography. Miranda Aldhouse-Green has argued that, although Pliny is the only authority to mention this ceremony, the main elements of his account are all features of Celtic religion that are confirmed elsewhere; these include oak trees, mistletoe, ritual banqueting, the moon, and bull-sacrifice. Pliny's account has been considered to  have contributed largely to the popular depiction of druids today, as white-clad wise men performing sacrifices in the forests and equipped with golden sickles. Chateaubriand incorporated a dramatized version of Pliny's scene in his "Les Martyrs", in which the druidess Veleda plays a part. In the "Astérix" comics, the druid Getafix is often depicted among oak trees, robed in white, and bearing a golden sickle.