The Ynglinga Saga is a historical narrative that forms part of the larger work known as the Heimskringla, written by the Icelandic historian Snorri Sturluson in the 13th century. It recounts the legendary history of the Yngling dynasty, which is said to have originated from the god Njord and his descendants. The saga blends myth and history, detailing the lives and reigns of early Swedish kings. The saga serves as an important source for understanding Norse mythology and the early Scandinavian royal lineage. It highlights the connection between the divine and the earthly rulers, illustrating how the Ynglings were believed to be descended from gods, which legitimized their authority in the eyes of their subjects.