The policy of Elizabeth as to the freedom of the sea is revealed still more clearly in the negotiations with the King of Denmark as to the right of fishery at Iceland and in the northern seas. Denmark claimed not only the Sound and the Belts and the maritime dominion of the Baltic, with the right of controlling the navigation through them, but also the seas intervening between the coasts of Norway on the one hand and Iceland and Greenland on the other. A similar claim was made to the sea between Norway and the Orkney and Shetland Isles, at all events prior to 1468, when they were acquired by Scotland. Putting aside altogether the differences that arose with regard to the dues exacted at the Sound and in connection with the Baltic, a great many disputes had occurred between England and Norway and Denmark as to the right of Englishmen to trade and fish at Iceland and along the Norwegian coast, and many treaties were made between the two Powers regulating that right. From an early period numerous barks from Lynn, Yarmouth, Hull, Scarborough, and other east coast ports, and from Bristol, frequented the northern seas for fishing and buying fish, and for traffic, visiting not only Iceland, but Helgeland, Nordland, and Finmark, and going at least as far east as Wardhouse or Vardö. In 1415 Henry V., at the request of King Eric, and notwithstanding an earnest petition of the Commons to the contrary,[198] prohibited his subjects from going to Iceland or other islands belonging to Norway or Denmark;[199] in 1429 the King of Denmark prohibited English merchants from purchasing fish at Finmark, or elsewhere in his dominions than at Bergen, against which the English petitioned Henry VI.;[200] and in 1490 an important treaty was concluded between Henry VII. and King John II. of Denmark and Norway, by which English subjects were granted liberty to sail freely to Iceland for fishing or trading on paying the usual customs, provided that they obtained a renewal of their license to do so every seven years.[201] This treaty was renewed in 1523 between Henry VIII. and Christian II.,[202] but disputes frequently arose later, and several embassies were charged with composing the differences.