Slavery, being contrary to natural right, is created only by municipal law. This is not only plain in itself, and agreed by all writers on the subject, but is inferable from the Constitution, and has been explicitly declared by this court. The Constitution refers to slaves as "persons held to service in one State, under the laws thereof." Nothing can more clearly describe a _status_ created by municipal law. In Prigg _v._ Pennsylvania, (10 Pet., 611,) this court said: "The state of slavery is deemed to be a mere municipal regulation, founded on and limited to the range of territorial laws." In Rankin _v._ Lydia, (2 Marsh., 12, 470,) the Supreme Court of Appeals of Kentucky said: "Slavery is sanctioned by the laws of this State, and the right to hold them under our municipal regulations is unquestionable. But we view this as a right existing by positive law of a municipal character, without foundation in the law of nature or the unwritten common law." I am not acquainted with any case or writer questioning the correctness of this doctrine. (See also 1 Burge, Col. and For. Laws, 738-741, where the authorities are collected.) The _status_ of slavery is not necessarily always attended with the same powers on the part of the master. The master is subject to the supreme power of the State, whose will controls his action towards his slave, and this control must be defined and regulated by the municipal law. In one State, as at one period of the Roman law, it may put the life of the slave into the hand of the master; others, as those of the United States, which tolerate slavery, may treat the slave as a person, when the master takes his life; while in others, the law may recognise a right of the slave to be protected from cruel treatment. In other words, the _status_ of slavery embraces every condition, from that in which the slave is known to the law simply as a chattel, with no civil rights, to that in which he is recognised as a person for all purposes, save the compulsory power of directing and receiving the fruits of his labor. Which of these conditions shall attend the _status_ of slavery, must depend on the municipal law which creates and upholds it. And not only must the _status_ of slavery be created and measured by municipal law, but the rights, powers, and obligations, which grow out of that _status_, must be defined, protected, and enforced, by such laws. The liability of the master for the torts and crimes of his slave, and of third persons for assaulting or injuring or harboring or kidnapping him, the forms and modes of emancipation and sale, their subjection to the debts of the master, succession by death of the master, suits for freedom, the capacity of the slave to be party to a suit, or to be a witness, with such police regulations as have existed in all civilized States where slavery has been tolerated, are among the subjects upon which municipal legislation becomes necessary when slavery is introduced.