The competitive version of hare coursing was given definitive form when the first complete set of English rules, known as the "Laws of the Leash", was drawn up in the reign of Elizabeth I reputedly by Thomas Howard, 4th Duke of Norfolk, providing for a pursuit of no more than two hounds, a headstart termed "Law" to be given to the hare for a fair run, and for the manner of awarding points on "Speed", "Go-bye", "Turn", "Wrench", "Kill" & "Trip", to judge the dogs' performance.