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Tribute from WikiPedia:

A tribute (from Latin tributum, contribution) is wealth one party gives to another as a sign of respect or, as was often case in historical contexts, of submission or allegiance. It also incorporated certain aspects of regulated trade in goods and services between the parties under a contractual relationship formed upon duress, and based upon the potential for threats if specific performance did not occur. A tributary or tributary state is a state, colony, region, or people who pay tribute to a more powerful, suzerain state.

Various ancient states, which could be called suzerains, exacted tribute from areas they had conquered or threatened to conquer. In case of alliances, lesser parties gave tribute to the dominant parties as a sign of allegiance and for the purposes of financing the agreed projects - usually raising an army. The term may also be used on religious tax used for maintenance of temples and other sacred places.

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