The introduction of African negroes into Puerto Rico made the institution of slavery permanent. It is true that King Ferdinand ordered the reduction to slavery of all rebellious Indians in 1511, but he revoked the order the next year. The negro was and remained a slave. For centuries he had been looked upon as a special creation for the purpose of servitude, and the Spaniards were accustomed to see him daily offered for sale in the markets of Andalusia. Notwithstanding the practical reduction to slavery of the Indians of la Española by Columbus, under the title of "repartimientos," negro slaves were introduced into that island as early as 1502, when a certain Juan Sanchez and Alfonso Bravo received royal permission to carry five caravels of slaves to the newly discovered island. Ovando, who was governor at the time, protested strongly on the ground that the negroes escaped to the forests and mountains, where they joined the rebellious or fugitive Indians and made their subjugation much more difficult. The same thing happened later in San Juan. In this island special permission was necessary to introduce negroes. Sedeño and the smelter of ores, Giron, who came here in 1510, made oath that the two slaves each brought with them were for their personal service only. In 1513 their general introduction was authorized by royal schedule on payment of two ducats per head. Cardinal Cisneros prohibited the export of negro slaves from Spain in 1516; but the efforts of Father Las Casas to alleviate the lot of the Indians by the introduction of what he believed, with the rest of his contemporaries, to be providentially ordained slaves, obtained from Charles II a concession in favor of Garrebod, the king's high steward, to ship 4,000 negroes to la Española, Cuba, Puerto Rico, and Jamaica (1517). Garrebod sold the concession to some merchants of Genoa. With the same view of saving the Indians, the Jerome fathers, who governed the Antilles in 1518, requested the emperor's permission to fit out slave-ships themselves and send them to the coast of Africa for negroes. It appears that this permission was not granted; but in 1528 another concession to introduce 4,000 negroes into the Antilles was given to some Germans, who, however, did not comply with the terms of the contract.