The cupidity of the proprietors of the fishery led to most cruel treatment of the divers and, if the accounts of the time are to be relied upon, a large percentage of them died under the harsh regime. About 1515 the unfortunate natives obtained an earnest and influential advocate in Bartolomé de las Casas, who, in 1516, prevailed upon the youthful Charles V to decree that the fishery should be prosecuted only in summer, that the divers should not be required to work more than four hours a day where the depth exceeded six fathoms, that they should receive good nourishment and half a quart of wine daily, should have hammocks or beds in which to sleep, and should be provided with clothes to put on as soon as they left the water.[272] And by later ordinances it was stipulated that death should be inflicted on any one forcing a free Indian to dive for pearls. In 1528 the resources of Coche Island were exploited with so much success that within six months “1500 marcs (12,000 ounces) of pearls” were secured. Pearl banks were successively found at Porlamar, Maracapana, Curiano, and at various places on the coast from the Gulf of Paria to the Gulf of Coro, a distance of over five hundred miles, which became designated the “Pearl Coast.” For a number of years previous to 1530, the output exceeded in value 800,000 piastres annually, approximating one half the produce of the American mines at that time.[273] It was largely these pearls that enriched the cargoes of many of those famous caravels that crossed the Atlantic to Spain. Indeed, for several decades, America was best known in continental Europe as the land whence the pearls came. An interesting account of an early effort to use dredges in the Cubagua pearl fishery was given by Girolamo Benzoni, who had lived in America from 1542 to 1555, and was familiar with the conditions. He states: