One of the principal incidents of a fee simple is the right of the owner to dispose of it, and in this way exert a control over his land even after death. Subject to certain disabilities of the person, to be noticed hereafter,31 the owner of a fee simple can now32 alien his estate by deed or by will very much as he pleases, provided he complies with the formalities of conveyancing required by law. There are, however, certain exceptions to this power. For instance, an owner of land, though he holds it in fee simple, cannot create estates and forms of tenure unknown to the law, or which are prohibited by law.33 Within this principle comes the rule against perpetuities, to be discussed hereafter,34 which prevents the creation of estates to take effect at a remote time in the future. Moreover, an owner of land is not permitted to convey to others, and at the same time forbid them to dispose of it, for the law allows only very limited restraints to be imposed on alienation.35 In some states there is a limitation on the amount of land which a man can give by will for charitable purposes.36 Furthermore, no one is allowed to dispose of his land in such a way that it is a fraud on his creditors;37 and, when an action is pending which involves the title to lands, they cannot be conveyed away so as to prejudice the other party.38 The most important exceptions, however, to the power of alienation, are those arising from the rights of dower, curtesy, and homestead, which will be explained in subsequent chapters.