This inquiry began with some sentences in James A. Williamson's magnificent study Hawkins of Plymouth:‘In peace or war in Europe', says Williamson, ‘there was no peace beyond the line. The phrase is often quoted by people who do not explain what line they mean. The Tropic of Cancer will not by itself answer the question, neither will the lines of demarcation. “Line” is in fact a misquotation which should be “lines”. The “lines of amity” were verbally agreed upon by the French and Spanish negotiators of the Peace of Cateau-Cambrésis in 1559. They were to be the Tropic of Cancer and the prime meridian passing through Ferro in the Canaries. On the European side of both lines the treaty was to be binding; west and south of them it was to be disregarded. The agreement was a belated recognition of what had long been the practice.’