Note 392 — Chapter XXVI · CONQUEST OF PERSIA. A.H. XXI., XXII. A.D. 642, 643.

The Zoroastrians must still have been numerous, especially in the outlying provinces, even in the Abbasside reigns. The social and political inducements brought to bear on them, and to induce a profession of Islam that was at first but superficial, are well brought out in ‘The Apology of Al Kindy’ (Smith and Elder, 1882). See especially the speech of Al Mâmûn, pp. xii. and 33.