John of England puts an embargo on wheat exported to Flanders in an attempt to force an allegiance between the states. He also puts a levy of a fifteenth on the value of cargo exported to France, and disallows the export of wool to France without a special license. The levies are enforced in each port by at least six men, including one churchman and one knight."King John" by Warren. Published by University of California Press in 1961. p. 122 John also affirms this year that judgements made by the court of Westminster are as valid as those made before the king himself or his chief justice."King John" by Warren. Published by University of California Press in 1961. p. 131
