“Angelus ad virginem” is a Medieval Latin carol celebrating the Annunciation by the angel Gabriel telling the Virgin that she would conceive and bear the Christ child. The Latin lyrics are (here’s a rough translation): 1. Angelus ad virginem Subintrans in conclave. Virginis formidinum Demulcens inquit “Ave.” Ave regina virginum, Coeliteraeque dominum Concipies Et paries Intacta, Salutem hominum. Tu porta coeli facta Medella criminum. 2. Quomodo conciperem, quae virum non cognovi? Qualiter infringerem, quae firma mente vovi? ‘Spiritus sancti gratia Perficiet haec omnia; Ne timaes, sed gaudeas, secura, quod castimonia Manebit in te pura Dei potentia.’ 3. Ad haec virgo nobilis Respondens inquit ei; Ancilla sum humilis Omnipotentis Dei. Tibi…