[citation needed] In 1363, members of the Swedish Council of Aristocracy, led by Bo Jonsson Grip, arrived at the court of Mecklenburg.

At the nobles' request, Albert launched an invasion of Sweden supported by several German dukes and counts and several Hanseatic cities in Northern Germany.

With the help of Danish and Swedish allies, King Haakon managed to temporarily beat back Albert and lay siege on Stockholm in 1371.

A peace agreement was signed, with the condition that Magnus be released and allowed to travel freely back to Norway (where he had also been king until 1355 and now spent the rest of his life).

In 1389, facing a loss of landholdings and wealth, the Swedish regency council turned to Haakon's widow Margaret to plead for help in getting rid of Albert.

He was released after 16 days of peace negotiations in 1395, during which he agreed to either give up Stockholm within three years, or pay large sums in retribution to Margaret.

Albert returned to Mecklenburg, remarried (to Agnes of Brunswick-Lüneburg), had another son and reigned as Duke of Mecklenburg-Schwerin until his death, seven months before Margaret's in 1412.