In the case of bishops, the theory was that the dean and chapter elected, and that the bishop-elect had to be confirmed by the Pope. This procedure provided for the selection locally of a suitable spiritual ruler, and also for the supremacy of the head of the Church. The mediæval bishops, however, were temporal lords of great influence in the civil affairs of the kingdom or principality within which their dioceses were placed, and it was naturally an object of interest to kings and princes to secure men who would be faithful to themselves. Hence the tendency was for the civil authorities to interfere more or less in episcopal appointments. This frequently resulted in making these elections a matter of conflict between the head of the Church in Rome and the head of the State in France, England, or Germany; in which case the rights of the dean and chapter were commonly of small account. The contest was in the nature of things almost inevitable even when the civil and the ecclesiastical powers were actuated by the best motives, and when both sought to appoint men competent to discharge the duties of the position with ability. But the best motives were not always active. Diocesan rents were large, and the incomes of bishops made excellent provision for the favourite followers of kings and of Popes, and if the revenues of one see failed to express royal or papal favour adequately, the favourite could be appointed to several sees at once. Papal nepotism became a byword; but it ought to be remembered that kingly nepotism also existed. Pope Sixtus V. insisted on appointing a retainer of his nephew, Cardinal Giuliano della Rovere, to the see of Modrus in Hungary, and after a contest of three years carried his point in 1483; and Matthias Corvinus, King of Hungary, gave the archbishopric of Gran to Ippolito d’Este, a youth under age, and after a two years’ struggle compelled the Pope to confirm the appointment in 1487.