Note 118
The Hegira was instituted by Omar, the second caliph, in imitation of the aera of the martyrs of the Christians, (D'Herbelot, p. 444;) and properly commenced sixty-eight days before the flight of Mahomet, with the first of Moharren, or first day of that Arabian year which coincides with Friday, July 16th, A.D. 622, (Abulfeda, Vit Moham, c. 22, 23, p. 45 - 50; and Greaves's edition of Ullug Beig's Epochae Arabum, &c., c. 1, p. 8, 10, &c.)

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The History Of The Decline And Fall Of The Roman Empire —Fall In The East —Chapter 50