 He blinded Manso and exiled him to the island of Sirenuse, with the support of Maria, whom he allowed to co-reign.The cruelty of this act turned the citizenry against the duke and duchess and, in April 1039, they ousted John and Maria and accepted Guaimar IV of Salerno as duke.Guaimar appointed Manso to act as duke in 1040 or 1043, under Salernitan suzerainty.