His first movement on the subject appears to have been an epistle addressed in November, 1073, to Gebhardt Archbishop of Salzburg, taking him severely to task for his neglect in enforcing the canons promulgated not long before in Rome, and ordering him to carry them rigidly into effect among his clergy.[536] This, no doubt, was a circular letter addressed to all the prelates of Christendom, and it was but a preliminary step. Early in Lent of the next year (March, 1074), he held his first synod, which adopted a canon prohibiting sacerdotal marriage, ordering that no one in future should be admitted to orders without a vow of celibacy, and renewing the legislation of Nicholas II. which commanded the people not to attend the ministrations of those whose lives were a violation of the rule.[537] There was nothing in the terms of this more severe than what had been decreed in innumerable previous councils—indeed, it was by no means as threatening as many decretals of recent date; but Gregory was resolved that it should not remain, like them, a mere protest, and he took immediate measures to have it enforced wherever the authority of Rome extended. The controversy as respects Italy has already been so fully described that to dilate upon it further would be superfluous. Even though Alexander II. in his later years had shrunk somewhat from the contest, yet from Naples to the Tyrol the question was thoroughly understood, and its results depended more upon political revolutions than on ecclesiastical exertions. Beyond the Alps, however, the efforts of preceding popes had thus far proved wholly nugatory, and on this field Gregory now bent all his energies. The new canon was sent to all the bishops of Europe, with instructions to promulgate it throughout their respective dioceses, and to see that it was strictly obeyed; while legates were sent in every direction to support these commands with their personal supervision and exertion.[538]