https://en.wikipedia.org/wiki/Amanita_muscariaProfessor Marija Gimbutienė, a renowned Lithuanian historian, reported to R. Gordon Wasson on the use of this mushroom in Lithuania. In remote areas of Lithuania Amanita muscaria has been consumed at wedding feasts, in which mushrooms were mixed with vodka. The professor also reported that the Lithuanians used to export A. muscaria to the Lapps in the Far North for use in shamanic rituals. The Lithuanian festivities are the only report that Wasson received of ingestion of fly agaric for religious use in Eastern Europe.
Amanita Muscaria grows in many places in Europe, but most populations have no memory of how their ancestors used it. If anyone has found reference of other European peoples traditional use of Amanita Muscaria i'd be interested to hear.