Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
Rom. 16:1, 3, 12; Phil. 4:2, 3; 1 Tim. 3:11, 5:9, 10; Tit. 2:3, 4). In these passages it is evident that females were then engaged in various Christian ministrations. Pliny makes mention of them also in his letter to Trajan (A.D. 110).