yore

noun

1. Chiefly Literary. time past: knights of yore.

adverb

2. Obsolete. of old; long ago.

noun

1. time long past (now only in the phrase of yore)

adverb

2. obsolete in the past; long ago

Old English geara (adv.) “of yore,” originally genitive plural of gear (see year), and used without of.