Bo Jonsson (Grip) (early 1330s – 20 August 1386) was head of the royal council and marshal under the regency of Magnus IV of Sweden. Also in the council was his friend and colleague, Karl Ulfsson av Ulvåsa, eldest son of Saint Birgitta. From 1369, during Albert of Sweden’s reign, he was Officialis Generalis (the king's highest official) and from 1371 Lord High Steward (drots in Swedish).
Gripsholm Castle was originally built as Bo Jonsson's seat. It was extended into a royal renaissance palace during the reign of King Gustav I.
Magnus IV was King of Sweden from 1319 to 1364, King of Norway as Magnus VII from 1319 to 1355, and ruler of Scania from 1332 to 1360. By adversaries he has been called Magnus Smek.
Magnus on the title page of his Swedish national lawcode (issue 1430).
King Magnus's shipwreck from a Russian manuscript
Head from Trondheim thought by Professor Jan Svanberg to be King Magnus.
Image: Eric of Sweden (1339) seal 1905