Erik Birgersson

Erik Birgersson (c. 1250 – 17 December 1275) was a Swedish duke from the House of Bjälbo (Folkungaätten) and the third son of Birger Jarl.

In 1275, the conflict had developed into an open war, and Magnus and Erik defeated Valdemar in the Battle of Hova with the help of Danish troops.

When the grave was opened and examined in May 2002, osteologist Torbjörn Ahlström from Lund University confirmed that the tomb contained the remains of three people – probably Birger, Mechtilde, and Erik.

His father's skeleton shows that he was about 172 cm long, while Erik was a few inches longer but with a much thinner build.

[10] Ahlström suggested that Erik may have had Marfan syndrome, a hereditary genetic disorder that affects the connective tissue.