Taxes from peasants and traders, as well as tributes from the local lords was the source of income of the kings in north India because:
The tax is known to be levied in medieval Europe and it is one that is often paid by persons or communities to the leader.
Note that Aids are taken by crown from their subjects, by a feudal lord and others.
So paying of these tax is important as this was due to the fact that revenues of the crown were not sufficient and The crown is one who collect aids from sections of the population so that the money will be available for use in the time of war, for towns or community development..
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