Final answer:
The question is based on a confusion with the Norse saga mentioned, as there is no account of Bjorn passing three magic weapons to his sons. Instead, the text references pertain to Viking explorations and medieval Norse history, including the voyages of Leif Eriksson and the Jelling stones.
Step-by-step explanation:
The student's question seems to refer to a section from the Norse saga The Saga of Hrolf Kraki and his Champions, but there is no clear answer because the question seems to be based on a confusion with the contents of the saga. In fact, there is no character named Bjorn passing down three magic weapons to his sons in this specific saga. Instead, the given text snippets relate to viking exploration and history, such as the voyages of Leif Eriksson, the runic inscriptions on the Jelling stones, and Christianization of the Danes under King Harald Bluetooth.
The text snippet related to Bjarni Heriulfsson recounts his accidental discovery of unknown lands that were possibly parts of America and the subsequent expedition led by Leif Eriksson after purchasing a ship from Bjarni. King Gorm the Old and King Harald Bluetooth raised the Jelling stones with runic inscriptions and Christian iconography, reflecting the transition from Norse paganism to Christianity in Denmark. These subjects are representative of Norse history and Viking explorations during the medieval period.