possible to fix upon certain constants. Repetition was bound to give them a life independent of agreement, adding thus a further example to the list of rules and legal institutions which have emerged from consistent use of contract. That the limits of an office should have depended on compact, the modern mind finds strange indeed, but in those times an office was a species of property and so quite properly the subject of contract. There were sound fiscal reasons, too, to say nothing of the expedience of being safeguarded against the whims of prerogative. The sources dealing with various dominions disclose a constant intervention by the crown that must often have driven a prudent administrator to distraction. The example of Henry 111 overriding the mandates of his son in Ireland is well known, 28 and likewise the efforts of Edward 111 to draw to himself the appeals from Gascony after its incorporation into Edward of Windsor's principality. 27 Covenant furnished the only means of placing a few barriers against the antic exercise of royal pleasure. Patent rolls and council records both show the bargaining process continuing in the fifteenth century. 28 In the course of these eventually disastrous years the content of commissions is pretty well stabilized, a result which was partly due to the occasional practice of commissioning by the formula of mere reference to a predecessor's patent. 29 A comparison of the commissions to the seneschal of Gascony of 1415 30 with those used for Ireland in 1423, 31 1428, 32 1462, 33 and finally in 1495 34 suggests that certain basic constituents of the governor's office are settled. The latter instruments are particularly important, because after the loss of Gascony a few decades before Columbus' first voyage, Ireland remained the only considerable possession of the crown and administratively the significant link between old and new policies. What Henry VII grants to Prince Henry and Edward Poyning, his deputy, is destined to be the core of what James I later grants to Lord Mountjoy 35 (1603) —a document which anticipates matter later to appear in royal commissions to American colonial governors. The threads of historical continuity are here ■they want only the tying. 26 3 Orpen, Ireland under the Normans (1920), 270-72. 27 5 Tout, Chapters in the Administrative History of Mediaeval England (1930), 313; cf. injra, p. xlvii. 28 E.g., 10 Rymer, Foedera 282 (Ireland, 1423); Calendar of Patent Rolls 1429-36, 69 (Gascony, 1430); Calendar of Patent Rolls 1436-41, 140 (Ireland, 1438); Calendar of Patent Rolls 1476-85, 90 (Ireland, 1478); 2 Proceedings and Ordinances of the Privy Council of England, 130; 3 ibid., 6, 8; 4 ibid., 53, 79, 92; 5 ibid., 206. 29 E.g., Calendar of Patent Rolls 1467-77, 205; ibid., 1477-84, 153, ibid., 1485-94, 84. 30 9 Rymer, Foedera 239 to John Tiptoft. 31 10 ibid., 282 to The Earl of March. 32 Calendar of Patent Rolls 7422-29, 475, to John Sutton. 33 Calendar of Patent Rolls 1461-67, 142, to the Duke of Clarence. 34 Calendar of Patent Rolls 1494-1509, 12. 35 1 Repertory of lnrolments on the Patent Rolls of Chancery in Ireland (1846), 17.