Efforts were also made to stimulate increase of population. Married men in Spain were forbidden to go to Cuba without taking their wives with them. Bachelors and widowers in Cuba were not permitted to employ Indians or to hold slaves, while illicit unions with native women were discouraged under penalty. Regular marriages with native women were, however, legitimized, and there were many such which resulted satisfactorily. In spite of these precautions there were, of course, some illegitimate children, and these the government took steps to legitimize, in order that they might, in default of other heirs, inherit their fathers' property and become substantial members of the community. The population of Cuba was materially increased in another and by no means commendable way. This was by the importation of negro slaves from Africa. The traffic in human beings began in the West Indies at about the time that Velasquez began the conquest and settlement of Cuba; perhaps a little before that time. Naturally, with the settlement of Cuba slave traders visited that island to offer their wares. It must be recorded to the credit of Velasquez that he at first prohibited the entrance of negro slaves into the island, and to the end of his life opposed it though he was forced after a while to permit it. This was partly on the ground of morals, and partly on that of prudence. He did not scruple to enslave to some extent the native Cubans. But that was in order to civilize and Christianize them, and also to afford the colonists protection from them in their wild native state. Such, at least, was the argument with which he justified his policy. Moreover, the Indians were already there, in the island, and had to be dealt with in some fashion. But it was manifestly a very different thing to import savages from some distant land for the express purpose of making slaves of them. The other reason was his fear that if many negroes were imported they and the Indians would so outnumber the whites as to be a grave menace.