From the late 13th Century the Court – presided over by the Lord High Constable or his deputies – was empowered to judge all cases of rioting, disorder, bloodshed and murder if such crimes occurred within four miles of the King, the King's Council, or the Parliament of Scotland.
Following James VI's move to England, the jurisdiction of the Lord High Constable was defined in terms of the "resident place" appointed for the Council.
[1] The Constable also held several honorific privileges, such as the right to sit on the right side of the King when he attended Parliament, custody of the keys to Parliament House, the ceremonial command of the King's bodyguards, and precedence above all Scotsmen except the members of the royal family and the Lord Chancellor of Scotland.
The office became hereditary in the 12th Century and was held by the Comyn family, but they ended up on the wrong side in the Wars of Scottish Independence.
[1] In 1952, the Court of Claims allowed the right of the Countess of Erroll, as Lord High Constable, to be present by deputy at the coronation of Queen Elizabeth II.