Frodi

King of Denmark. According to Icelandic tradition, especially from the Poetic Edda and Prose Edda, Frodi's reign marked a period of peace in the northern kingdoms.

According to both Icelandic Poetic Edda (especially the Grottasong) and Prose Edda, Frodi was a son of Fridleif, so he was often called Fridleifsson, and he was the grandson of Skiold, founder of the Danish royal house on the island of Zealand. And in the Ynglinga Saga, Snorri wrote that Frodi was a son of Dan, and father of Halfdan and Fridleif; this contradicts the Prose Edda, which Snorri say that Fridleif was Frodi's father. And in the Hrolfs saga Kraka, it's not known who his father was, and Halfdan was his brother. There are no mentions of a son or daughter, so one would assume that he died childless.

On the other hand, in the Skjoldunga Saga, Frodi was called Frodo. He was the son of Ingialldus and the father of Halfdanus (Halfdan).

And Saxo called Frodi as Frode, a son of Hadding and Hardgrep, daughter of Wagnhofde. Frode had two sisters, Swanhwid and Ulfhild. Frode was the father of Ro (Hror) and Helge.

In the Hrolfs saga Kraka, his brother Halfdan was king of Denmark, Frodi murdered his brother to gain the throne. Frodi turned out to be a tyrant. He sought unsuccessfully to assassinate Halfdan's sons, Helgi and Hroar. His young nephews set fire to his palace, and Frodi was killed.

In Grottasong, an Eddaic poem, there's no hint that Frodi murdered his brother to gain the Danish throne. His reign was marked by a long period of peace in the North, where there was no war and murder. According to Snorri (in the Ynglinga Saga), he was called Frode Mikellati.