Note 97 — PART I FROM THE DATE OF THE GREAT FIRE OF ROME IN THE REIGN OF NERO TO THE DEATH OF MARCUS ANTONINUS A.D. 64–A.D. 180
Reading edition
So called from the position it holds between the longer recension of the “ten Letters,” three of which are put aside as later compilations, and the shorter recension of three Letters which Canon Cureton found in the Syrian MS. and published, believing that these “three” were the only genuine Epistles of the martyr-bishop.