[2] The de Grassis men of Baldassare's generation married women from similar Bolognese patrician families including the Zambeccari, the Paleotti, the Bucchi, the Aldrovandi, and the Gozzadini.
Paris' older brother Achille de Grassis, followed his uncle as an Auditor of the Rota, served as a papal diplomat under Julius II, was appointed Bishop of Città di Castello in 1506 and Archbishop of Bologna in 1511 and died in November 1523.
[5] Paris' eldest brother, Agamenone de Grassis, was the family's anchor in Bologna, where he worked as a notary, and held several governmental offices including a senator's seat in the Quaranta Consiglieri from 1511.
The diary of his colleague, and successor as senior Master of Ceremonies, Biagio Martinelli notes de Grassis' periodic activities at the papal court, but it does not indicate that he was a constant presence there.
De Grassis was not a historian, merely a chronicler; with professional care he jotted down the minutiae of all pontifical ceremonies, trivial occurrences at the Roman Curia, the consistories and processions, the coming and going of ambassadors, journeys, etc.
The definitive discussion of de Grassis' diary, the manuscripts, and his other compositions can be found in Marc Dykmans' collection of essays in the journal Ephemerides liturgicae (1982, 1985, 1986).
De Grassis wrote treatises on a variety of topics pertaining to Roman Catholic liturgy and the liturgical ceremonies and diplomatic practices of the papal court in the early sixteenth century.