Editing Magnus Ladulås (section)

== Early life ==
[[File:Birger Jarl crop.jpg|thumb|left|150px|Magnus's father Birger Jarl]]
Magnus was born around 1240 as the second son of [[Birger Jarl]] (1200–66) and Princess [[Ingeborg Eriksdotter of Sweden|Ingeborg]], daughter of King [[Erik Knutsson]] and sister of King [[Erik Eriksson]] of Sweden. The early life of Magnus is poorly documented, but he seems to have received an extensive education.<ref name=":0" />

Erik Eriksson ruled until 1250 and died without an heir. After his death, Magnus' elder brother [[Valdemar, King of Sweden|Valdemar]] (1239–1302) became king, but the true power was held by their father Birger Jarl who acted as a [[regent]]. In 1255, Magnus was granted the title of a {{Lang|la|iunior dux}}, 'junior jarl'.<ref name=":0" /><ref name=":1">{{Cite book |last=Line |first=Philip |url=http://archive.org/details/kingshipstatefor0000line |title=Kingship and state formation in Sweden, 1130-1290 |date=2006 |publisher=Brill |others= |isbn=978-90-04-15578-7 |location=Leiden |pages=131-134}}</ref>

When Birger died in 1266, Magnus assumed his title as the Duke of Sweden. The title was not accompanied by any unified territory, but by a number of scattered estates and rights to collect taxes and fines. He also received [[Nyköping Castle]] in [[Södermanland]].<ref name=":0" /><ref>{{Cite web |last=Suvanto |first=Seppo |title=Maunu Ladonlukko |url=http://urn.fi/urn:nbn:fi:sks-kbg-000129 |access-date=26 April 2024 |website=Kansallisbiografia |series=Studia Biographica 4 |publisher=Suomalaisen Kirjallisuuden Seura |publication-place=Helsinki |publication-date=23 June 2000 |issn=1799-4349}}</ref> 

There is no indication that he would have received the powers of his father.<ref name=":1" /> According to the [[Erik's Chronicle]], Magnus wanted to share the Royal power with his brother, which led to a conflict.<ref name=":0" />