"This sense development arose in the consequence of the wars waged by Otto the Great and his successors against the Slavs, a great number of whom they took captive and sold into slavery." [Klein]
O.E. Wealh "Briton" also began to be used in the sense of "serf, slave" c.850; and Skt. dasa-, which can mean "slave," is apparently connected to dasyu- "pre-Aryan inhabitant of India." More common O.E. words for slave were þeow (related to þeowian "to serve") and þræl (see thrall). The Slavic words for "slave" (Rus. rab, Serbo-Croatian rob, O.C.S. rabu) are from O.Slav. *orbu, from the PIE base *orbh- (also source of orphan) the ground sense of which seems to be "thing that changes allegiance" (in the case of the slave, from himself to his master). The Slavic word is also the source of robot. Applied to devices from 1904, especially those which are controlled by others (cf. slave jib in sailing, similarly of locomotives, flash bulbs, amplifiers). Slavery is from 1551; slavish is attested from 1565; in the sense of "servilely imitative" it is from 1753. slave-driver is attested from 1807. In U.S. history, slavocracy "the political dominance of slave-owners" is attested from 1840."The negro no longer submits with grace to be called 'uncle' or 'auntie' as of yore." ["Harper's Magazine," October 1883]
Edgar: I know thee well: a serviceable villain,
As duteous to the vices of thy mistress
As badness would desire.
"King Lear," Act IV, Scene vi
"I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description [hard-core pornography]; and perhaps I could never succeed in intelligibly doing so. But I know it when I see it, and the motion picture involved in this case is not that." [U.S. Supreme Court Justice Potter Stewart, concurring opinion, "Jacobellis v. Ohio," 1964]Pornographer is earliest form of the word, attested from 1850. Pornocracy (1860) is "the dominating influence of harlots," used specifically of the government of Rome during the first half of the 10th century by Theodora and her daughters.