The Normans used the Anglo-Saxon concepts of jurisdictional powers. Thus when William confirmed "customs" to the abbot of Ely, these were understood to include the following: 1) sac and soke - the right to hold a court of private jurisdiction and enjoy its profits, 2) toll - a payment in towns, markets, and fairs for goods and chattel bought and sold, 3) team - persons might be vouched to warranty in the court, the grant of which made a court capable of hearing suits arising from the transfer of land, 4) infangenthef - right of trying and executing thieves on one's land, 4) hamsocne, 5) grithbrice - violation of the grantees' special peace, for instance that of the sheriff, 6) fihtwite - fine for a general breach of the peace, 7) fyrdwite - fine for failure to appear in the fyrd [national militia]. Every shire had at least one burh, or defensible town. Kings had appointed a royal moneyer in each to mint silver coins for local use. On one side was the King's head in profile and on the other side was the name of the moneyer. When a new coinage was issued, all moneyers had to go to London to get the new dies. William's head faced frontally on his dies, instead of the usual profile used by former Kings. William held and presided over his council three times a year, as was the custom, at Easter, Christmas, and Whitsuntide. This was an advisory council and consisted of earls, greater barons, officers of the King's household, archbishops, and bishops. It's functions were largely ceremonial. William's will was the motive force which under lay all its action. When it was administering royal justice, it was called the Royal Court. The justiciar was the head of all legal matters and represented the King in his absence from the realm. The Treasurer was responsible for the collection and distribution of revenue. The Chancellor headed the Chancery and the chapel. Sheriffs became powerful figures as the primary agents for enforcing royal edicts. They collected the royal taxes, executed royal justice, and presided over and controlled the hundred and shire courts. They also took part in the keeping of castles and often managed the estates of the King. Most royal writs were addressed to the sheriff and shire courts. They also led the shire militia in time of war or rebellion. Royal income came from customary dues, profits of coinage and of justice, and revenues from the King's own estates. For war, a man with five hides of land was required to furnish one heavy-armed horseman for forty days service in a year. A threat of a Viking invasion caused William to reinstitute the danegeld tax. To impose this uniformly, he sent commissioners to conduct surveys by sworn verdicts of appointed groups of local men. A detailed survey of land holdings and the productive worth of each was made in 1086. The English called it the "Doomsday Book" because there was no appeal from it.