Lothair II
Upon the second partition by the Treaty of Prüm and Emperor Lothair's death in 855, his second son Lothair II subsumed his portion of Upper Burgundy into his Middle Frankish kingdom of Lotharingia, while his younger brother Charles received Cisjurane Burgundy and the Kingdom of Provence. When Charles died in 863, Lothair II also gained some northern districts of the deceased's kingdom. The Provence territory in the south passed to the eldest brother King Louis II of Italy.