Carucage.
Carucage was a medieval English land tax based on the size of the taxpayer's estate. It was levied six times: by Richard I in 1194 and 1198, John in 1200, and Henry III in 1217, 1220, and 1224. The taxable value of an estate was initially assessed from the Domesday Book survey, but other methods were later employed, such as valuations based on the sworn testimony of neighbours or the number of plough-teams (example depicted) the taxpayer used. Carucage never raised as much as other taxes, but it helped fund the ransom for Richard's release in 1194, the tax John paid to Philip II of France on land he inherited in that country, and the cost of Henry III's military campaigns in England and continental Europe. The tax was an attempt to secure new sources of revenue when new demands were being made on royal finances. Unlike the older danegeld tax, carucage was an experiment in revenue collection and only levied for specific purposes.
