Baldr (also Balder, Baldur) is a god in Norse mythology, who is given a central role in the mythology. His precise function is, however, disputed. He is often interpreted as the god of love, peace, forgiveness, justice, light or purity, but he was not directly attested as a god of such.
He is the second son of Odin and the goddess Frigg. His twin brother is the blind god Höðr.
Jacob Grimm in his Teutonic Mythology (ch. 11) identifies Old Norse Baldr with the Old High German Baldere (2nd Merseburg Charm, Thuringia), Palter (theonym, Bavaria), Paltar (personal name) and with Old English bealdor, baldor "lord, prince, king" (used always with a genitive plural, as in gumena baldor "lord of men", wigena baldor "lord of warriors", et cetera). Old Norse shows this usage of the word as an honorific in a few cases, as in baldur î brynju (Sæm. 272b) and herbaldr (Sæm. 218b), both epithets of heroes in general.
Grimm traces the etymology of the name to *balþaz, whence Gothic balþs, Old English bald, Old High German pald, all meaning "white, good".
But the interpretation of Baldr as "the brave god" may be secondary. Baltic (cf. Lithuanian , Latvian ) has a word meaning "the white, the good", and Grimm speculates that the name may originate as a Baltic loan into Proto-Germanic. In continental Saxon and Anglo-Saxon tradition, the son of Woden is called not Bealdor but Baldag (Saxon) and Bældæg, Beldeg (Anglo-Saxon), which shows association with "day", possibly with Day personified as a deity. This, as Grimm points out, would agree with the meaning "shining one, white one, a god" derived from the meaning of Baltic baltas, further adducing Slavic Belobog and German Berhta.