Wiktionary
adv. (obsolete spelling of thereof English)
Usage examples of "therof".
For this day, which we celebrate once a yeare in honour of the god Risus, is alwaies renowned with some solemne novel, and the god doth continually accompany with the inventor therof, and wil not suffer that he should be sorrowfull, but pleasantly beare a joyfull face.
After that Venus was weary with searching by Sea and Land for Psyches, shee returned toward heaven, and commanded that one should prepare her Chariot, which her husband Vulcanus gave unto her by reason of marriage, so finely wrought that neither gold nor silver could be compared to the brightnesse therof.
Bi vche grome at his degre graythely wat3 serued Ther wat3 mete, ther watz myrthe, ther watz much ioye, That for to telle therof hit me tene were, And to poynte hit 3et I pyned me parauenture.
Thus in Arthurus day this aunter bitidde, The Brutus boke3 therof beres wyttenesse.