Cosimo de' Medici's Illuminated Bible and Patristic Library (Vespasiano Commission)
Catalogue updated 2026-06-08
A verified public-domain excerpt for this text is still being set. The folio is catalogued and linked below; an original Sub Rosa rendering will follow.
What it is
In approximately 22 months in the late 1440s, Cosimo de' Medici commissioned Vespasiano da Bisticci to produce around 200 manuscript volumes — copied by some 45 scribes — for the library of the Badia Fiesolana, the majority being theology and liturgical books. Vespasiano's memoir (Vite di uomini illustri) records Cosimo's personal piety and direct investment in the project, including his habit of retiring to the Badia and praying with the monks he had housed and funded. This entry covers not a single discrete text but the documented devotional library Cosimo curated for a monastic community, constituting the religious textual world in which the early Medici formed their faith. Its significance is as a patronage act and devotional environment rather than as a readable text.
Why it still matters
The patristic texts Cosimo gathered — above all Augustine's Confessions and the writings of Gregory the Great — are among the most devotionally useful in Christian history and remain fully accessible today in translation; reading any of them is a direct participation in the tradition Cosimo was funding.
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Kept alongside
The Imitation of Christ
De Imitatione Christi
Written by Thomas à Kempis in the Netherlands in the circle of the Brethren of the Common Life — the same Devotio Moderna movement that directly shaped Margaret of York's documented devotional practice and the piety of Isabella of Portugal at the Burgundian court — the Imitation became the most copied vernacular religious text in 15th-century Europe, circulating in thousands of manuscripts and hundreds of early printed editions. Its four books move from the vanity of worldly learning through conformity to Christ, inward consolation, and finally the sacrament of the Eucharist, forming a complete program of interior conversion. No specific ducal inventory copy has been identified linking this text to Valois-Burgundy by name, but its presence in court circles of this era and region is established through movement history rather than document. It remains the second most widely read Christian book after the Bible.
Prison Meditations on Psalms 51 and 31
Savonarola composed these meditations on Psalm 51 (Miserere, known as 'Infelix ego') and Psalm 31 (In te, Domine, speravi) in Latin while imprisoned in the Palazzo della Signoria in 1498 awaiting trial and execution, his right hand temporarily spared from further torture so he could sign his confession. Approximately 15 Italian editions appeared by 1500, making them among the most rapidly disseminated devotional texts of the early print era and ensuring pan-European reach within a decade. Savonarola had preached at San Marco — the monastery Cosimo de' Medici built and patronized — from 1482 and was the friar summoned to Lorenzo de' Medici's deathbed in 1492, giving these works an indirect but real connection to the Medici devotional world. The Miserere meditation (Infelix ego) became one of the most reprinted Latin spiritual texts of the sixteenth century.
Infelix ego (Meditation on Psalm 51 / Miserere)
Infelix ego, omnium auxilio destitutus
A profound Latin meditation on Psalm 51 (Miserere) composed in his Florentine prison cell by the Dominican friar Savonarola shortly before his execution on 23 May 1498. Despite being the Medici's principal political opponent, his text circulated in fifteen Italian editions by 1500 in the very city where Giovanni de' Medici (future Leo X) and Giulio de' Medici (future Clement VII) were formed; Martin Luther endorsed it in 1523. Josquin des Prez, Cipriano de Rore, and William Byrd set versions to polyphony, securing its place across a century of European devotional music. Its connection to Medici piety is environmental rather than by commission or documented use.