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.