What is Time Of Memory?

Legal Definition
According to the English common law, which has been altered by 2 & 3 Wm. IV., c. 71, the time of memory commenced from the reign of Richard the First, A. D. 1189. 2 Bl. Com. 31.

2. But proof of a regular usage for twenty years, not explained or contradicted, is evidence upon which many public and private rights are held, and sufficient for a jury in finding the existence of an immemorial custom or prescription. 2 Saund. 175, a, d; Peake's Ev. 336; 2 Price's R. 450; 4 Price's R. 198.
-- Bouviers Law Dictionary
Legal Definition
In English law. Time commencing from the beginning of the reign of Richard I. 2 Bl. Comm. 31. Lord Coke defines time of memory to be "when no man alive hath had any proof to the contrary, nor hath any conusance to the contrary." Co. Litt86a, 86b
-- Black's Law Dictionary
Legal Definition
-- Ballentine's Law Dictionary