Geoffrey Chaucer,
Chaucer's Works (ed. Skeat) Vol…
(1900)
“ English. 'Thou is the language of a lord to a servant, of an equal to an equal, and expresses also companionship, love, permission, defiance, scorn, threatening: whilst ye is the language of a servant to a lord, and of compliment, and further expresses honour, submission, or entreaty. ”
