1.the servitia communia or servitia Camerae Papae: a payment by an abbot, bishop, or archbishop, due upon his induction, of the anticipated revenue of the next year in his new benefice.
This payment is traceable to the oblatio paid to the pope when consecrating bishops as metropolitans or patriarchs. When, in the middle of the 13th century, the consecration of bishops became established as the sole right of the pope, the oblations of all bishops

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Note added at 14 mins (2016-09-26 13:18:01 GMT)
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Since the fifteenth century this tax has been generally known as annates, a term comprehending all money taxes paid into the Apostolic Camera (papal treasury) on the occasion of the collation of any ecclesiastical benefice by the Pope. Under this term were included four classes of payments: (1) the servitia communia, payable on the granting of bishoprics or monasteries, appointments made in a consistory; these payments were divided between the cardinals and the papal treasury.