Prayer Book of Lorenzo de' Medici (Clm 23639)
Liber precum Laurentii de Medicis
Catalogue updated 2026-06-08
Deus qui corda fidelium Sancti Spiritus illustratione docuisti: da nobis in eodem Spiritu recta sapere.
Our renderingO God, who didst instruct the hearts of the faithful by the light of the Holy Spirit: grant us by the same Spirit to relish what is right.
What it is
A 556-page parchment prayer-book (Bayerische Staatsbibliothek, Clm 23639) commissioned by Lorenzo de' Medici as a wedding gift for his eldest daughter Lucrezia on her 1488 marriage to Florentine banker Jacopo Salviati. Written by court scribe Antonio Sinibaldi and illuminated by Francesco Rosselli with ten full-page miniatures and twelve calendar medallions in gold and silver, it represents the peak of Florentine private devotional luxury. The calendar structure and Latin prayer texts were designed for intimate, daily use by the bride, weaving together the liturgical year with prayers suited to a lay noblewoman's domestic and spiritual life. It stands as material evidence that structured daily prayer — following the church calendar — was an expected practice for lay aristocratic women in the Medici circle.
Why it still matters
The Latin prayers for the church calendar it contains parallel those of any modern Roman breviary; the manuscript demonstrates how structured daily prayer shaped the lives of lay aristocratic women, and its calendar-based rhythm can be recovered with any current Catholic daily prayer book.
Oratio starter guide
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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.