Diocletian's accession in 284 did not mark an immediate reversal of disregard to Christianity, but it did herald a gradual shift in official attitudes toward religious minorities. In the first fifteen years of his rule, Diocletian purged the army of Christians, condemned Manicheans to death, and surrounded himself with public opponents of Christianity. Diocletian's preference for autocratic government, combined with his self-image as a restorer of past Roman glory, presaged the most pervasive persecution in Roman history. In the winter of 302, Galerius urged Diocletian to begin a general persecution of the Christians. Diocletian was wary, and asked the oracle of Apollo for guidance. The oracle's reply was read as an endorsement of Galerius's position, and a general persecution was called on 24 February 303.