Built around the Tiezzi Mazzoni della Stella Maestri collection, the library holds more than 12,000 volumes, including over 60 incunabula and around 5,000 16th-century editions. The collection documents the height of Medici power during the Grand Ducal Cinquecento, from the recognition of Cosimo I’s title to the dynasty’s ties with Europe’s ruling houses. Particularly significant is the extensive corpus of Medici edicts, offering rare insight into governance, economic policy, and legal development in the Grand Duchy of Tuscany. Long a center of Florentine humanism, Santa Maria degli Angeli once hosted leading intellectual figures and safeguarded important book collections. The new library continues that tradition, marking a major step in the museum’s strategy to support historical research while preserving one of Europe’s most influential cultural legacies.