Final answer:
Giovanni Pierluigi da Palestrina wrote the 'Gloria' from the Pope Marcellus Mass, which is a notable example of Italian Renaissance polyphonic sacred music.
Step-by-step explanation:
The 'Gloria' from the Pope Marcellus Mass was written by Palestrina. Giovanni Pierluigi da Palestrina, an Italian Renaissance composer, is known for his work in polyphonic sacred music. His contributions are often seen as the culmination of Renaissance polyphony. The Pope Marcellus Mass is one of his most famous works and exemplifies the stylistic purity and clarity for which Palestrina is renowned.
The Gloria is a central movement of the Ordinary of the Roman Catholic Mass, and Palestrina's setting of the Gloria is noted for its melodic lines and the interweaving of its vocal parts. This masterwork by Palestrina not only had a significant impact on sacred music but also became a model for future works in the genre.