By a charter of
Edward III dated the 6 March 1351, there was granted for life to
Henry, Duke of Lancaster (inter alia), a court of chancery, a chancellor, and such other
jura regalia in the county of Lancaster as pertained to a count palatine. On 28 February 1377, a similar charter was granted for the term of his life to
John, King of Castile and Leon, Duke of Lancaster. On 16 February 1390,
Richard II by charter granted these jura regalia to the Duke of Lancaster and his heirs male.
Henry IV on his accession by a charter of the 14 October 1399, declared that these jura regalia were not to be changed by the King's accession and severed the Duchy from the Crown, the reason being that he had the Duchy by a sure and indefeasible title, but specially because his title to the Crown was not so assured, as the right to the Crown was in the heir of
Lionel, Duke of Clarence, second son of Edward III. From that time the county palatine of Lancaster remained in the possession of the Sovereign as an inheritance separate from the Crown. The county palatine of Lancaster under these charters had a court called the Court of Chancery of Lancaster, which was by 1909 regulated by a number of statutes, and also an Attorney General of the County Palatine and Duchy of Lancaster. ==Jurisdiction and appeals==