|Her Majesty's High Court of Chivalry|
Courtroom in October 2017
|Composition method||Appointed by Earl Marshal|
|Appeals to||Judicial Committee of the Privy Council|
|Judge term length||One hereditary, otherwise depends on the appointment|
|Currently||Duke of Norfolk|
|Since||1672 (current office granted by Letters Patent)|
Her Majesty's High Court of Chivalry is a civil law (i.e., non common law) court in English and Welsh law with jurisdiction over matters of heraldry. The court has been in existence since the fourteenth century; however, it rarely sits. The sole judge is now the hereditary Earl Marshal of England, the Duke of Norfolk, though if not a professional lawyer, he normally appoints a professional lawyer as his lieutenant or surrogate.
In Scotland, these types of cases are heard in the Court of the Lord Lyon, which is a standing civil and criminal court, with its own judge – the Lord Lyon King of Arms and its own procurator fiscal (public prosecutor) under the Scottish legal system.
The court was historically known as the Curia Militaris, the Court of the Constable and the Marshal, or the Earl Marshal's Court.
Since it was created in the fourteenth century the court has always sat when required, except for the short time between 1634 and its temporary abolition by the Long Parliament in 1640 when it sat on a regular basis. During this time the court heard well over a thousand cases, of which evidence survives from 738 cases. 
The court was last convened in 1954 for the case of Manchester Corporation v Manchester Palace of Varieties Ltd; prior to this, the Court had not sat for two centuries and before hearing the case, the Court first had to rule whether it still existed. The proceedings opened with the reading of various letters patents in order to make clear that the Duke of Norfolk was indeed Hereditary Earl Marshal and that he had appointed Lord Goddard as his lieutenant in the court. It also had ruled that the Earl Marshal was allowed to sit in judgement without the Lord High Constable of England, an office which until 1521 was also held as a hereditary dignity by the Dukes of Buckingham. The case itself was that the Palace theatre had been displaying the arms of the Manchester Corporation (now Manchester City Council) both inside and on its seal and this usage implied that it was linked with the city's council. The Corporation had requested that the theatre stop using it, but this request had been refused. The court ruled in favour of the Corporation.
In 1832, the Privy Council Appeals Act 1832 made the Privy Council the appeal court for cases heard by the High Court of Chivalry. From 1 February 1833, following the passage of the Judicial Committee Act 1833, appeals have been heard directly by the Judicial Committee of the Privy Council. Prior to that, and in common with the admiralty and ecclesiastical courts, appeals from the Court of Chivalry were made to the Crown in Chancery, with appeals being heard by Commissioners appointed by letters patent under the Great Seal in each case. Sittings by these Commissioners became known as the High Court of Delegates by the time of the 1832 Act.
Historically the court had two hereditary judges – the Duke of Norfolk as Earl Marshal of England, and the Duke of Buckingham as Lord High Constable of England – but in 1521 Edward Stafford, 3rd Duke of Buckingham was convicted of treason, stripped of his titles and offices, and executed. Since then the office of Lord High Constable of England has only been appointed to perform ceremonial duties during a Coronation and there has only been the Earl Marshal acting as the sole judge.
The Privy Council Appeals Act 1832 abolished the High Court of Delegates and transferred its powers to hear appeals in ecclesiastical and admiralty cases to the King in Council. The Council had previously served only as a court of final resort from the Delegates under the infrequently invoked procedure of petitioning for commissions of review.