Augustine of Hippo

(ubi sup.) Either let us suppose that Matthew was silent about that Angel, whom they saw on entering, whilst Mark said nothing of him, whom they saw outside sitting on the stone, so that they saw two and heard severally from two, the things which the Angels said concerning Jesus; or we must understand by entering into the sepulchre, their coming within some inclosure, by which it is probable that the place was surrounded a little space before the stone, by the cutting out of which the burial place had been made, so that they saw sitting on the right hand in that space him whom Matthew designates as sitting on the stone.