![St Leo the Great/Pope Leo I](http://www.ststeve.com/wp-content/uploads/2018/04/Herrera_mozo_San_León_magno_Lienzo._Óvalo._164_x_105_cm._Museo_del_Prado-189x300.jpg)
San León magno (St Leo the Great/Pope Leo I), by Francisco de Herrera el Mozo (1622-1685). From Wikipedia.
¶ Or this:
O God, who didst strengthen thy holy Bishop Leo to contend earnestly for the truth of thy Son’s sacred Humanity: Mercifully grant that we may be guided by the light of his teaching to believe rightly the Incarnation of our Lord Jesus Christ; who liveth and reigneth with thee and the Holy Ghost, ever one God, world without end. Amen.