text: who is ubayd allah abu marwan?   general at service of the emir abd ar-rahman ii of córdoba, that was uncle of the emir al-hakam i.  in 826 revolted aissó (or aysun) and requested help to abd al-rahman ii. this sent to the general ubayd allah known also as abu marwan, that it arrived to zaragoza in may 827. from there it happened to territory of the county of barcelona, reaching barcelona in summer, that it was besieged without success, ransacking its surroundings. then moved to girona that either they could occupy (october 10, 827). louis the pious, while, knowing the musulman raid, ordered to his son pippin of aquitania, and to the counts hugo of tours and matfred of orleans, the recruitment of an army, but the recruitment was slow and when it was formed already abu merwan and its army was returning to its dominances. the rebels abandoned the country with them (827).