He was the son of the Duke
Henry III of Mecklenburg and
Ingeborg of Denmark. Albert was also a claimant to the Danish throne after the death of King
Valdemar IV, but
Olaf II succeeded instead. After his father Henry died in 1383, Albert ruled Mecklenburg jointly with his uncles
Albert III and
Magnus I and his cousin
John IV. He was married to Elisabeth of Holstein, the daughter of
Nicholas, Count of Holstein-Rendsburg and died in December 1388. In 1404 his widow Elisabeth married Duke
Eric V of Saxe-Lauenburg. ==References==