Alleluia Angelus domini*
The incipit 'Alleluia Angelus domini' can correspond to different chants; however, I assume that the incipit found in this fragment represents chant 008415 on the basis of the comparison with other sources from Braga.
Indeed, the contents of this fragment match the chants that can be read for the same liturgical feasts in the Temporal Antiphoner P-BRs (Braga) Arquivo da Sé Ms. 32 and in the Breviary without music from Braga ('Breviarium Braccarense') printed by João Gherlinc for Pedro de Barzena in 1492 (http://purl.pt/22000). The
'Alleluia Angelus domini' chant 008415 is fully written (with notation) in Ms. 32, on fol. 208rv (http://pemdatabase.eu/image/33369).