For this last purpose, namely, to organise the Christian forces against the Turks, the Popes claimed the right of levying a fixed tax on all ecclesiastical property. The amount of this varied from one- thirtieth to one-tenth of the annual revenue, and as a rule it was raised only for some definite period of years. Even in the days when the crusading fever was universal, such a tax excited a great deal of opposition; but when Europe had grown weary of the struggle, and when the Popes could do little owing to the failure of the temporal rulers to respond to their appeals, this form of taxation was resented bitterly, and the right of the Popes to raise taxes in this way off ecclesiastical property was questioned by the ecclesiastics affected as well as by the temporal rulers. England and France took measures to protect themselves; but in Germany the absence of any strong central authority, and the want of unity among the princes made it difficult to offer any effective resistance to these demands. In 1354, 1372, 1459, 1487, and in 1500, the German bishops protested strongly against the attempts of the Pope to levy taxes on ecclesiastical property. But in addition to these extraordinary levies there were many permanent sources of revenue for the support of the Papal Court. In the first place from the time of Boniface IX. annats, which consisted of a certain proportion of the first year's revenue, were to be paid by all clerics on whom a minor benefice was conferred by the Holy See. In case of the major benefices, bishoprics and abbacies, the /servitia communia/ and the /servitia minuta/ took the place of annats. The /servitia communia/ was a fixed sum the amount of which depended upon the annual revenue of the See or abbey, and was divided between the Pope and the cardinals of the Curia. The /servitia minuta/, amounting to about 3 1/2 per cent. of the /servitia communia/, was given to the lower officials, who prepared the letters of appointment. The revenues of vacant Sees and the property of deceased bishops were also claimed by the Holy See. From England the Pope received yearly the Peter's Pence, and from all countries that acknowledged his feudal jurisdiction he was entitled to a definite annual tribute.