The most feared spirit in Thailand is Phi Tai Hong, the ghost of a person who has died suddenly of a violent death. The Koran discusses spirits known as "jinn". In Europe there is the recurring fear of "returning" or "revenant" deceased who may harm the living. This includes the Scandinavian "gjenganger", the Romanian "strigoi", the Serbian "vampir", the Greek "vrykolakas" among others.