Beatrice of Naples [Beatriz de Aragón]
Beatrice of Aragon, daughter of Ferdinand I of Naples and Isabella of Clermont, was twice queen of Hungary by her marriages to Matthias Corvinus (in 1476) and, after his death in 1490, to Vladislaus II (in 1491), but the latter marriage was declared illegal by the pope in 1500, and she returned to Naples in 1502.
The Mellon chansonnier was most likely compiled as a wedding gift for Beatrice ca. 1475-1476.
Emilio Ros-Fábregas, "Beatrice of Naples [Beatriz de Aragón]", Books of Hispanic Polyphony, ed. E. Ros-Fábregas (accession date: 21 Oct 2021), https://hispanicpolyphony.eu/ca/person/30450