'Of yore' definitions:

Definition of 'Of yore'

From: GCIDE

Yore \Yore\ (y[=o]r), adv. [OE. [yogh]ore, yare, [yogh]are, AS. ge['a]ra;akin to ge['a]r a year, E. year. [root]204. See Year.] In time long past; in old time; long since. [Obs. or Poetic] [1913 Webster]
As it hath been of olde times yore. --Chaucer. [1913 Webster]
Which though he hath polluted oft and yore, Yet I to them for judgment just do fly. --Spenser. [1913 Webster]
Of yore, of old time; long ago; as, in times or days of yore. "But Satan now is wiser than of yore." --Pope. [1913 Webster]
Where Abraham fed his flock of yore. --Keble. [1913 Webster]