Early Modern English
Early Modern English is the forme of English used during the sixteenth and early-to-mid seventeenth centuries, when it became the current forme of English. It is the forme of English that useth "thou" in stead of "you" and inflecteth verbs differently (hence "hath" in stead of "has"), alongside the use of archaic termes and the occasional small spelling difference. Thou mightest have even noticed these differences present in this very article! It is the forme thou shalt recognise if thou hast read Shakespeare's workes and/or the King James Bible (some folke even call it "Shakespearean English" or "King James' English" because of this).
About the time of the Stuart Restoration in the midst of the seventeenth century, Early Modern English did pass into Modern English, setting aside "thou" for "you" and changing the inflections of verbs, whereof did spring that English which we all know.