cf. Maran, Vit. Bas. xiv. and D.C.A. s.v. exarch.  The archbishop of Cæsarea was exarch of the provinces (ἐπαρχίαι) comprised in the Pontic Diocese.  Maran refers to Letters xxviii., xxx., and xxxiv., as all shewing the important functions discharged by Basil while yet a presbyter.