Etymology
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mischief (n.)

c. 1300, "evil condition, misfortune; hardship, need, want; wickedness, wrongdoing, evil," from Old French meschief "misfortune, harm, trouble; annoyance, vexation" (12c., Modern French méchef), verbal noun from meschever "come or bring to grief, be unfortunate" (opposite of achieve), from mes- "badly" (see mis- (2)) + chever "happen, come to a head," from Vulgar Latin *capare "head," from Latin caput "head" (from PIE root *kaput- "head").

Meaning "harm or evil considered as the work of some agent or due to some cause" is from late 15c. Sense of "playful malice" is recorded by 1784. The meaning has softened with time; in Middle English to be full of mischief was to be miserable; to make mischief was "to result in misery."

Mischief Night in 19c. England was the eve of May Day and of Nov. 5, both major holidays, and perhaps the original point was pilfering for the next day's celebration and bonfire; but in Yorkshire, Scotland, and Ireland the night was Halloween. The useful Middle English verb mischieve (early 14c.), used by Skelton and Gavin Douglas, has, for some reason, fallen from currency.

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love-making (n.)
"courtship," mid-15c.; see love (n.) + make (v.). Phrase make love is attested from 1570s in the sense "pay amorous attention to;" as a euphemism for "have sex," it is attested from c. 1950.
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malefic (adj.)

"doing mischief, producing disaster or evil," 1650s, from Latin maleficus "wicked, vicious, criminal," from male "ill" (see mal-) + -ficus "making, doing," from combining form of facere "to make, do" (from PIE root *dhe- "to set, put"). Related: Malefical (1610s).

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hob (n.)
"clown, prankster," short for hobgoblin (q.v.). Hence, to play (the) hob "make mischief" (by 1834).
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devilment (n.)

"trickery, roguishness, mischief, action befitting a devil," 1771; see devil + -ment.

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Ate 
Greek goddess or personification of infatuation and blundering mischief, from ate "damage, ruin; guilt; blindness, dazzlement, infatuation; penalty, fine," which is of uncertain origin.
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mischievous (adj.)

early 14c., "unfortunate, disastrous, miserably, wretchedly," probably from mischief + -ous. Sense of "playfully malicious or annoying" is attested by 1670s. "The stressing on the second syllable was common in literature till about 1700; it is now dialectal, vulgar, and jocular" [OED]. Related: Mischievously; mischievousness.

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firebrand (n.)
also fire-brand, c. 1200, "piece of wood kindled at a fire, a piece of something burning," from fire (n.) + brand (n.). Used for spreading fire. Figurative sense of "one who kindles mischief or passions" is from late 14c.
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beautification (n.)
"act of making beautiful," 1630s, from beauty + -fication "a making or causing."
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Ralph 
masc. proper name, shortened from Radulf, from Old Norse Raðulfr (Old English Rædwulf), literally "wolf-counsel," from rað "counsel" (see read (n.)) + ulfr "wolf" (see wolf (n.)). The Century Dictionary also lists it as English printers' slang for "An alleged or imagined evil spirit who does mischief in a printing house."
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