Idunnis a goddesss who belongs to the Aesir tribe of deities. Idunn is depicted as the owner and dispenser of a fruit that imparts immortality. In modern books on Norse mythology, these fruits are almost invariably considered to be apples, but this wasn’t necessarily the case in heathen times. The Old Norse word for “apple,” epli, was often used to denote any fruit or nut, and “apples” in the modern English sense didn’t arrive in Scandinavia until late in the Middle Ages. Whatever species Idunn’s produce belongs to, its ability to sustain the immortality of the gods and goddesses makes Idunn an indispensable presence in Asgard.
Idunn is the wife of Asgard’s court poet and minstrel, Bragi. One Old Norse poem has Loki accuse her of sleeping with her brother’s murderer, but the identities of her brother and his slayer are unknown, and no tale explaining this accusation has survived into the modern era.