What does "yore" mean?

Yore: In time long past; in old time; long since. [Obs. or Poetic] As it hath been of olde times yore. Chaucer. Which though he hath polluted oft and yore, Yet I to them for judgment just do fly. Spenser. Of yore, of old time; long ago; as, in times or days of yore. "But Satan now is wiser than of yore." Pope. Where Abraham fed his flock of yore. Keble.