I know there are tons of threads on the Jesus Prayer but most of them seemed to be about books on the prayer or about how to utilize the prayer, and I'm more interested in its history. From the limited reading I've done, it seems the Jesus Prayer is most closely associated with Hesychasm, which seems to have mainly originated in the 13th or 14th century.
From Wikipedia: "It appears that the particularity of the term Hesychast has to do with the integration of the continual repetition of the Jesus Prayer into the practices of mental ascesis that were already used by hermits in Egypt. Hesychasm itself is not recorded in Lampe, which indicates that it is a later usage, and the term Jesus Prayer is not found in any of the Fathers of the Church. Saint John Cassian (c. 360–435) presents as the formula used in Egypt for repetitive prayer, not the Jesus Prayer, but "O God, make speed to save me: O Lord, make haste to help me". By the 14th century however, on Mount Athos the terms Hesychasm and Hesychast refer to the practice and to the practitioner of a method of mental ascesis that involves the use of the Jesus Prayer assisted by certain psychophysical techniques. Most likely, the rise of the term Hesychasm reflects the coming to the fore of this practice as something concrete and specific that can be discussed."
Does anyone know when the prayer came into wide use? Any other related tidbits would be greatly appreciated!