The campaign against foreigners fishing on the British coast, which opened up the claims of England in the seventeenth century to the sovereignty of the sea and introduced a new principle into English international policy, originated in another set of ideas, which James brought with him from Scotland. The Scottish people had been always very jealous of foreigners sharing in their fisheries, and, as we have seen, never consented to give them the liberty to fish, so freely accorded by England. Moreover, a tax or tribute, called the “assize-herring,” was imposed upon the native fishermen in Scotland, and formed a part of the revenues of the crown. Although its value was not great, James conceived the idea of levying it also from the foreign fishermen, who frequented the British seas in large numbers, and before he formally demanded it in 1609, some curious negotiations took place with a syndicate of London merchants who proposed to form a fishery association based on the taxation of foreign fishermen, and in return they promised a handsome revenue to the king. The desire for an increased revenue may therefore have had something to do with the proposal to restrain unlicensed fishing on the British coasts. But neither this consideration, the practice in Scotland, nor the king’s passion for his prerogative, fully accounts for the reversal of the long-settled policy of England, which was accomplished with the concurrence of the Privy Council, and, so far as may be judged, with the full approval of the people. In truth, a great change had taken place in the national sentiment. England had now entered upon the long struggle for commercial and maritime supremacy, with the aim of increasing the power of the nation against all rivals.[234] It was obvious to every one that the great rival and competitor was the Dutch Republic, whose rapid rise to the first commercial state in Europe deeply impressed the minds of English statesmen and writers. In the reign of Elizabeth, the common interest of the two countries in opposing Spain prevented measures being taken to curb the growing power of the Dutch. But early in the seventeenth century this motive had lost its force. James had promptly concluded peace with Spain, and even spoke of the Dutch as rebels.[235] Thus, during his reign arose that bitter rivalry and keen emulation of the Dutch which continued throughout nearly the whole century, and of which the English claim to the sovereignty of the sea may be looked upon as an important phase. It was against the United Provinces that the claim was directed, and as the Dutch themselves openly boasted that the sea fisheries were the foundation of their shipping, wealth, and power, it was to the sea fisheries that England first turned in her efforts to cripple them.