In the rhetoric of 17th-century England, those who opposed the increasing power of the kings claimed that the country was headed for a condition of slavery. Locke therefore asks, facetiously, under what conditions such slavery might be justified. He notes that slavery cannot come about as a matter of contract (which became the basis of Locke's political system). To be a slave is to be subject to the absolute, arbitrary power of another; as men do not have this power even over themselves, they cannot sell or otherwise grant it to another. One that is deserving of death, i.e., who has violated the law of nature, may be enslaved. This is, however, but the state of war continued (2nd Tr., § 24), and even one justly a slave therefore has no obligation to obedience.