On 9 August 1333 Edward III renounced all royal claims over the Isle of Man, and recognised it as an independent kingdom under its then king, William Montacute, 1st Earl of Salisbury.
Totum jus et clamium quod habemus, habuimus vel aliquo modo habere poterimus, in Insula de Man cum suis pertinentiis quibuscumque; ita quod nec Nos, nec haeredes nostri, seu quivis alius nostro nomine, aliquid juris vel clamii in Insula praedicta de caetero exigere poterimus vel vindicare.The whole right and claim that We have, We have had, or in any manner shall We be able to have in the future, in the island of Man with all its privileges, so that neither We, nor Our heirs, or any other in Our name, will not demand or avenge in the future the aforesaid right or claim to the island.William le Scrope, Earl of Wiltshire was the last King of Mann in this line, claiming descent from the House of Godred Crovan, the earlier Norse Rulers.
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.
We have given and granted … to the said Earl of Northumberland the Island, Castle, Peel and Lordship of Man, and all the islands and lordships appertaining to the said Isle of Man, which belonged to Sir William le Scrope deceased, whom in his life We lately conquered, and so have decreed him conquered, and which by reason of that conquest, as having been conquered, We seized into Our hands; which decree and conquest as touching the person of the said William and all his lands and tenements, goods and chattels, as well within as without Our Kingdom, in Our Parliament by the assent of the Lords temporal … at the petition of the Commons of Our said Kingdom, are confirmed …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.
[10] However, the Latin style Rex Manniae et Insularum (King of Mann and the Isles) continued to be occasionally used in official documents until at least the 17th century.