Eric the Victorious in the context of "Princess of Sweden"

The Ynglings were a dynasty of kings, first in Sweden and later in Norway, primarily attested through the poem Ynglingatal. The dynasty also appears as Scylfings (Old English: Scylfingas, Old Norse: Skilfingar) in Beowulf. When Beowulf and Ynglingatal were composed sometime in the eighth to tenth centuries, their respective authors (scops and skalds) expected their audience to have a great deal of background information about these kings, which is shown in the allusiveness of the references.

According to sources such as Ynglingatal and Íslendingabók, the Fairhair dynasty in Oppland, Norway was in fact a branch of the Ynglings (here Yngling is explicitly used as the name of the dynasty). Saxo Grammaticus held that the Ynglings also included Eric the Victorious, who is usually the first king in modern regnal lists, and his descendants. However, this does not tally with Icelandic sources.

The monarchy of Sweden is centred on the monarchical head of state of Sweden, by law a constitutional and hereditary monarchy with a parliamentary system. There have been kings in what now is the Kingdom of Sweden for more than a millennium. Originally an elective monarchy, it became a hereditary monarchy in the 16th century during the reign of Gustav Vasa, though virtually all monarchs before that belonged to a limited and small number of political families which are considered to be the royal dynasties of Sweden.

The official continuous count usually begins with the kings who ruled both Svealand and Götaland as one kingdom. Sweden's monarchy is amongst the oldest in the world, with a regnal list stretching back to the tenth century, starting with Eric the Victorious; the Swedish monarchy has, for the past thousand years, undergone cycles of decline and strengthening, culminating in the modern constitutional monarchy.

The legendary kings of Sweden (Swedish: sagokonungar, sagokungar, lit. 'saga kings / fairy tale kings') according to legends were rulers of Sweden and the Swedes who preceded Eric the Victorious and Olof Skötkonung, the earliest reliably attested Swedish kings. The stories of some of these kings may be embellished tales of local rulers or chiefs that actually existed. For example, Hygelac (500 A.D.) is believed to have historical basis due to his name being attested in Frankish, English, Danish and Icelandic sources. But the historicity of most legendary kings remains impossible to verify due to a lack of sources. The modern Swedish monarchy considers Eric the Victorious to have been the first King of Sweden.

In medieval Swedish lists of kings, the figure generally represented as the first king of Sweden is Olof Skötkonung, the first Christian king of Sweden and the first Swedish king to mint coins. The earlier kings are for the most part only attested in Icelandic sagas, sometimes contradictory mixtures of myths and poetry, written in the 11th–13th centuries, several centuries after the events described in them. What is genuine history and what is myth and legend in the sagas is impossible to determine today, and everything contained in them must as such be regarded as legendary, if not fictional. The earliest legendary dynasty, the Ynglings, may be an entirely invented sequence of kings, serving to justify and legitimize the later dynasties and rulers in Scandinavia who claimed descent from them. Many of the legendary kings would have ruled during the Migration Period (c.  375–550) and subsequent Vendel Period (c.  550–790), but larger political structures in Scandinavia (i. e. the medieval kingdoms of Sweden, Norway and Denmark) are not believed to have formed and centralized until the Viking Age.

Sigrid the Haughty (Old Norse: Sigríðr (hin) stórráða; Swedish: Sigrid Storråda) is a Scandinavian queen appearing in Norse sagas. Sigrid is named in several late and sometimes contradictory Icelandic sagas composed generations after the events the stories describe, but there is no reliable, historical evidence attesting to the veracity of her depiction in those tales. She is reported by Heimskringla to have been the wife of Eric the Victorious of Sweden, as being sought after by Olaf Tryggvasson, and then married to Sweyn Forkbeard of Denmark. In other writings, however, author Snorri Sturluson says that Sweyn the Dane was married not to Sigrid but some other woman.

It is unclear if the figure of Sigrid was a real person. Some recent scholars identify her with a documented Polish wife of Eric and perhaps Sweyn mentioned by medieval chroniclers and referred to as 'Świętosława' by some modern historians, but the potential husbands attributed to Sigrid lived over a wide date range and other modern scholars believe Sigrid may be an amalgamation of several historical women.

Aud Haakonsdottir of Lade, also called Öda Haakonsdottir of Lade (10th century), was a legendary Swedish Viking Age queen consort, according to the sagas the last spouse of King Eric the Victorious of Sweden.