This volume was written in 1489 by Ambrosius Alantsee (†1505).
Ambrosius, originally from Füssen, enrolled at the University of
Basel in 1468/69 and, as can be proven, wrote several mostly
liturgical books between 1484 and 1492 at the Carthusian Monastery
in that city. Among them is this Epithalamium (bridal or wedding
song) for Mary. Possibly this is the same Ambrosius Alantsee who is
attested as prior of St. Mang's Abbey in Füssen in 1491.