τῆς ἱερᾶς πίστεως τὸ διδασκαλεῖον. Eusebius refers here to the famous catechetical school of Alexandria (upon which, see above, Bk. V. chap. 10, note 2). The appointment of Achillas to the principalship of this school would seem to exclude Pierius, who is said by Photius to have been at the head of it (see above, note 42).