This act by Magnus freed the yeomanry from the duty to provide sustenance for travelling nobles and bishops, and "locked the barns".

After his death, Magnus' elder brother Valdemar (1239–1302) became king, but the true power was held by their father Birger Jarl who acted as a regent.

[7] In 1275, Duke Magnus started a rebellion against Valdemar, supported by his younger brother Erik and King Eric Klipping of Denmark.

[11] The deposed King Valdemar managed, with Danish help in turn, to regain provinces in Götaland in the southern part of the kingdom, and Magnus had to recognize that in 1277.

Magnus ordered his kinsman Torkel Knutsson, the Lord High Constable of Sweden as the guardian of his heir, the future King Birger, who was about ten years old at father's death.

In spring 2011, archaeologists and osteologists from the University of Stockholm were granted permission to open one of the royal tombs in the Riddarholmen Church, traditionally believed to contain the remains of Magnus Ladulås and some of his relatives.

Preliminary studies indicated a notable sickly disposition in one skeleton, previously presumed to belong to Magnus Ladulås based on descriptions of his ailments.

In 2014, the team discovered a previously unknown brick chamber between the two tombs, but further excavation was halted due to legal and administrative challenges.