ETYMOLOGY
from peace (n.) + -ify, influenced by pacify (vb.)
EXAMPLE
“… yet she wolde not but rather suffre dethe she was so stedfaste in the feythe relygyous and chaste, and thus he beynge in great perplexyte and doutfull peryll, the foresayde Blessyd vyrgyne his Donghter was warnyd by an Aungell that she shulde goo to her Fader and bydde hym agree to the other Kynys requeste and desyre, and that she shulde assent therto, / and so shulde she comforte and assure her Fader and peacyfye and make glad the other parte.
From: Here Begynneth the Kalendre of the Newe Legende of Englande, 1516
Lexicophilia 