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He was a Frankish nobleman loyal to King Charles the Bald of West Francia. At the Assembly of Narbonne in 849, Aleran and Isembart were empowered to consolidate the territory for the Frankish Kingdom and bring the Hispanic Marches held by rebel forces loyal to Pepin II back into control of the kingdom.
Aleran died sometime in 851 or 852 and Charles appointed Odalric as count of Barcelona in 852.