At the same time that Diocletian abdicated at Nicomedia, Maximianus, according to an agreement between them, performed a similar ceremony at Milan, proclaiming Constantius as Augustus, and Severus as Caesar. Both Severus and Maximinus Daza were inferior persons, and creatures of Galerius, who insisted upon their nomination in preference to that of Maxentius and Constantine, whom Diocletian had at first proposed. Maximianus retired to his seat in Lucania, but not being endowed with the firmness of Diocletian he tried some time after to recover his former power, and wrote to his old colleague to induce him to do the same. "Were you but to come to Salona," answered Diocletian, "and see the vegetables which I grow in my garden with my own hands, you would no longer talk to me of empire." In his retirement he used to observe to his associates how difficult it is, even for the best-intentioned man, to govern well, as he cannot see everything with his own eyes, but must trust to others, who often deceive him. Once only he left his retirement to meet Galerius in Pannonia for the purpose of appointing a new Caesar, Licinius, in the place of Severus, who had died. Licinius, however, did not prove grateful, for after the death of Galerius, in 311, he ill-treated his widow, Valeria, Diocletian's daughter, who then, with her mother, Prisca, took refuge in the territories of Maximinus Daza. The latter offered to marry Valeria, but on her refusal exiled both her and her mother into the deserts of Syria, and put to death several of their attendants. Diocletian remonstrated in favor of his wife and daughter, but to no purpose, and his grief on this occasion probably hastened his death, which took place at his residence near Salona in July, 313. In the following year his wife and daughter were put to death by order of Licinius.