in our old customs, silver coin, or pieces of bullion that anciently passed for money. By Doomsday tenure, some rents to the king were paid in argento albo, common silver pieces of money; other rents in libris urbis et penisatis, in metal of full weight and purity; in the next age, that rent which was paid in money, was called Blanch feurm, and... and afterwards white rent; and what was paid in provisions, was termed black mail.