Harald Wartooth or Harold Hiltertooth (Old Norse: Haraldr hilditǫnn; Modern Swedish and Danish: Harald Hildetand; Modern Norwegian: Harald Hildetann) was a legendary king of Sweden, Denmark, Norway and the historical northern German province of Wendland, in the 8th and 9th century. According to the Danish Chronicon Lethrense, his empire reached as far as the Mediterranean.
Saxo Grammaticus, in Gesta Danorum, gives two different accounts about why Harald had the name wartooth. According to one tradition, it was due to Harald having lost two of his teeth in battle against Veseti, the lord of Scania, after which two new teeth grew out. Saxo further tells that according to another opinion, the name was derived from Harald having protruding teeth. A scholarly view, however, holds the name to be derived from a name for "war hero".
All sources describe him as the son of Ivar Vidfamne's daughter Auðr the Deep-Minded (but Hervarar saga calls her Alfhild). According to Sögubrot, Njal's Saga and the Lay of Hyndla, Harald was the son of Hrœrekr Ringslinger (slöngvanbaugi), the king of Zealand. Sögubrot relates that his mother later married Raðbarðr, the king of Garðaríki and they had the son Randver. However, according to Hervarar saga, both Harald and Randver were the sons of Valdar and Alfhild. Njal's Saga adds that Harald had the son Þrándr the Old (hinn gamli) who was the ancestor of one of the characters in the saga.Sögubrot also mentions that he had a son named Þrándr the Old (gamli), but also adds a second son, Hrœrekr Ringslinger (slöngvandbaugi), who apparently was named exactly like his grandfather. Landnámabók informs that this Hrœrekr Ringslinger the younger had a son named Þórólfr (Thorolfur) "Váganef", who in turn had the son Vémundr Wordplane. Vémundr was the father of Valgarður (Valgardur), the father of Hrafn "heimski" (the Foolish). Hrafn was one of the first settlers in Iceland and settled on the southern coast, in Rangárvallasýsla (county of Rángárvellir).