Duke of Mecklenburg, who died in 1375. It happened with very young age, along with his brother Juan, to Duke Henry, his father. But Alberto, which was the largest, exercised all the authority. In 1347, the two brothers solemnly recognized his Duchy of Empire Stutgard dependence. In 1352, Alberto and Juan divided their States, leaving Alberto with the Duchy of Mecklenburg and Juan with the Stutgard.