Thor (Old Norse: Þórr) is the god of thunder and lightning in Norse mythology, associated with strength, storms, hallowing, sacred groves and tress and fertility. He is the son of Ojdin and Jörð, the personification of the Earth, and is the strongest of the Æsir.
The champion of Asgard, Thor is said to protect both it and Midgard from the likes of the jǫtnar, a race of beings native to Jötunheimr. He is known in Old English as Þunor (Thunor) and in Old High German as Donar (runic þonar ᚦᛟᚾᚨᚱ), all of which stem from the Proto-Germanic *Þunraz, meaning "thunder".
The modern English weekday Thursday (from Old English Þūnresdæg, “Thunor’s [Thor’s] day”) bears the god's name.