The Leonardo da Vinci notebooks are among the most remarkable documents of the Renaissance. Filled with mirror writing, anatomical studies, engineering designs and observations of water and light, they let us follow a restless intellect page by page. For collectors of manuscripts, they remain the ultimate benchmark of how a working document can become a cultural treasure.
A Lifetime on Paper
Leonardo (1452–1519) carried small notebooks and used loose sheets throughout his career. He recorded ideas as they came, mixing drawings with dense notes written from right to left. Many pages combine unrelated subjects, from optics to the flight of birds.
He apparently intended to organise his material into treatises, but never completed the task. The surviving pages therefore show thinking in progress rather than finished books, which is precisely what makes them so compelling.
How the Pages Were Scattered
On Leonardo’s death, his papers passed to his pupil Francesco Melzi, who preserved them in Italy. After Melzi’s death the collection was gradually dispersed. In the late sixteenth century the sculptor Pompeo Leoni gathered many sheets and reassembled them into large compilations, cutting and pasting pages in the process.
One of these compilations is the Codex Atlanticus, now in the Biblioteca Ambrosiana in Milan. Other sheets reached England, where a large group of drawings entered the Royal Collection at Windsor.
The Principal Codices
Today the surviving material is divided among a handful of famous volumes and groups, each with its own history:
- Codex Atlanticus (Biblioteca Ambrosiana, Milan): the largest compilation, rich in mechanical and engineering studies.
- Windsor drawings (Royal Collection): including Leonardo’s celebrated anatomical studies.
- Paris Manuscripts (Institut de France): a series of notebooks taken to France during the Napoleonic era.
- Codex Arundel (British Library) and the Forster Codices (Victoria and Albert Museum).
- Madrid Codices (Biblioteca Nacional de España): rediscovered in 1967.
- Codex Leicester: devoted largely to water, earth and astronomy, and privately owned.
Why the Notebooks Matter to Collectors
The notebooks show that the value of a manuscript lies not only in beauty but in what it reveals about its maker. Provenance is central: every Leonardo codex carries a documented chain of ownership, from Melzi and Leoni to the institutions that hold them today. That same attention to history guides serious collecting in manuscripts and rare books.
They also remind us how fragile such documents are. Rebinding, cutting and dispersal altered many pages, and modern conservators have worked to restore their original order where possible. For any collector, condition, binding history and completeness are essential questions.
Leonardo’s Legacy in the Art Market
Because almost all of Leonardo’s notebooks are held by public institutions, they rarely, if ever, appear on the market. Their influence nonetheless shapes how scholars and collectors approach drawings and annotated manuscripts by other Renaissance masters. Readers interested in the wider field can explore our profiles of artists and our selection of Old Master paintings, where the same standards of scholarship apply.
The notebooks endure as an invitation to look closely. Each sheet records an act of observation, and each one rewards the patient reader with a glimpse of how Leonardo understood the world.
Frequently Asked Questions
Why did Leonardo write backwards?
Leonardo was left-handed and wrote most of his notes in mirror script, from right to left. Scholars generally regard this as a personal habit rather than a secret code.
Where are Leonardo’s notebooks today?
They are dispersed among major institutions, including the Biblioteca Ambrosiana in Milan, the Royal Collection at Windsor, the Institut de France in Paris, the British Library and the Victoria and Albert Museum in London, and the Biblioteca Nacional in Madrid.
Who owns the Codex Leicester?
The Codex Leicester was acquired by Bill Gates in 1994 and is one of the few Leonardo manuscripts in private hands.
