As Henry's predecessor,
Edward III, had recognised Mann as an independent kingdom, Henry IV did not directly claim the Manx throne, but instead proclaimed that he had acquired the island by
right of conquest, which in international legal theory at that time erased any existing constitutional arrangements. He then on 19 October 1399 granted the Island, as a fiefdom under the English Crown, to
Henry Percy, 1st Earl of Northumberland together with wide-ranging powers of government and associated regalities, together with the style of 'Lord of Man', in a position of
feudality and thus without
sovereignty. Despite this, Percy styled himself as 'King of Mann'. Following Percy's treasonous rebellion, Henry IV granted the
suzerainty of the Isle of Man, on similar terms but only for the term of his life, to
Sir John Stanley in 1405. In addition, but separate from the power of governance over the Island, John Stanley was also granted the patronage of the
Diocese of Sodor and Man. A second letters-patent were issued and re-granted to Sir John Stanley on 6 April 1406, the difference being that the grant was inheritable and had a different feudal fee, the service of which comprised rendering
homage and a
tribute of two falcons to all future kings of England on their
coronations.
Kings of Mann in this period •
Henry Percy, 1st Earl of Northumberland (1399–1405) •
Sir John Stanley (I) (1405–1414) •
Sir John Stanley (II) (1414–1437) •
Thomas Stanley, 1st Baron Stanley (1437–1459) •
Thomas Stanley, 1st Earl of Derby (1459–1504) •
Thomas Stanley, 2nd Earl of Derby (1504‒1521) ==Lord of Mann (1521–Present)==