 Thor closely resembles other Indo-European deities associated with the thunder: the Celtic Taranis, the Baltic Perkūnas, the Slavic Perun, and particularly the Hindu Indra, whose red hair and thunderbolt weapon the vajra are obvious parallels. Scholars have compared Indra's slaying of Vritra with Thor's battle with Jörmungandr. Although in the past it was suggested that Thor was an indigenous sky god or a Viking Age import into Scandinavia, these Indo-European parallels make him generally accepted today as ultimately derived from a Proto-Indo-European deity.
