Gregory the Great and Transubstantiation

Q. Did Gregory advocate the Roman dogma of transubstantiation?

Gregory I [Gregory the Great], Bishop of Rome (c. 540-604 A.D.):

Christ is not here by the presence of his flesh, and yet is he absent nowhere by the presence of his majesty. (J. P. Minge, Patrologiæ Cursus Completus, [1857], Patrologiæ Latinæ, Tomus LXXVI, Sancti Gregorii Magni, Homiliarum In Evangelia, Lib. II, Homilia XXI, [Habita ad populum in basilica beatæ Mariæ virginis, die sancto Paschæ], § 4, Col. 1171). Here Trans. (Thomas Becon, The Catechism of Thomas Becon, S.t.p. Chaplain to Archbishop Cranmer, Prebendary of Canterbury, &c., Ed. John Ayre, [Cambridge University Press, 1844], p. 274). Here

The word incarnate both tarrieth and goeth away: he goeth away in his body, but he tarrieth in his godhead. (J. P. Minge, Patrologiæ Cursus Completus, [1857], Patrologiæ Latinæ, Tomus LXXVI, Sancti Gregorii Magni, Homiliarum In Evangelia, Lib. II, Homilia XXX, [Habita ad populum in basilica sancti Petri apostoli, die sancto Pentecostes], § 2, Col. 1221). Here Trans. (Thomas Becon, The Catechism of Thomas Becon, S.t.p. Chaplain to Archbishop Cranmer, Prebendary of Canterbury, &c., Ed. John Ayre, [Cambridge University Press, 1844], pp. 274-275). Here

~ Soli Deo Gloria