Voynich and Padua | The Book-Loan Problem: Cermisone and Dottori

A manuscript can be physically present in one person’s house and legally belong to someone else.

That sounds obvious.

For provenance research, it is devastating.

Stefano Dottori’s 1428 testament records that some books in his possession had been lent to him by Antonio Cermisone. In the same testament, Dottori left part of his own books to Cermisone and Sigismondo Polcastro.

The result is a clean Paduan warning: custody, ownership, use, inheritance and location are different states. A manuscript can move through all five without changing its text.

Quick Read

Dottori’s 1428 testament explicitly remembers books borrowed from Cermisone.
The same testament leaves some of Dottori’s own books to Cermisone and Polcastro.
Polcastro and Savonarola were appointed executors.
This creates several different book relationships inside one medical friendship network.
A borrowed manuscript can be absent from its owner’s house precisely when an inventory is taken.
A borrower’s inventory can contain books that are not legally his.
A testament can restore a loan, distribute owned books, or mention neither if the volume has already moved.
Therefore a missing manuscript from Cermisone’s inventory—or its presence in Dottori’s household—would not by itself establish ownership.
The same logic applies to the Carrara Zago inventory, monastic loans and later private libraries.
For Voynich, “not listed in the owner’s inventory” is weaker negative evidence when active lending is documented.

Ownership Is Not Location

Historical book catalogues tempt us into a modern library model.

We imagine a person’s books sitting together in one room.

Professional books often did not behave that way.

A physician can lend a useful work to a colleague or student for months or years.

The manuscript is then:

owned by A;
physically held by B;
used in B’s teaching or practice;
possibly copied by C;
eventually returned, inherited or lost.

One object now has several simultaneous historical relations.

Dottori Gives Us a Documented Example

Treccani’s biography of Stefano Dottori is unusually valuable because it preserves the legal memory of book loans.

In his 1428 testament, Dottori recalled having received books on loan from Antonio Cermisone.

This is not a hypothetical model.

It is an explicit book-custody relationship between two central physicians in the Paduan network.

The Same Testament Separates Borrowed Books From Owned Books

Dottori also left part of his books to Cermisone and Polcastro.

That means the testament distinguishes two fundamentally different classes:

books Dottori was holding for someone else;
books Dottori had the authority to bequeath.

This distinction is central to archival reconstruction.

A list of physical books is not automatically an ownership list.

The Inventory Problem

Suppose Cermisone died while a valuable medical manuscript was still with Dottori.

A household inventory could omit it.

Suppose Dottori died first.

His household might physically contain the manuscript even though it belonged to Cermisone.

If the legal note identifying the loan vanished, a later researcher could assign the book to the wrong owner.

inventory presence ≠ ownership; inventory absence ≠ non-ownership.

This Changes How We Read the 1404 Zago Inventory

The Carrara inventory of 9 May 1404 remains one of the best documentary controls in the Padua hypothesis.

But an inventory is a state capture.

It records what the document’s procedure was able to identify at that moment.

If books were actively lent, commissioned, rebound, deposited elsewhere or temporarily with physicians, an inventory may not represent the complete moving library ecosystem.

This does not license inventing absent Carrara books.

It changes the strength of the negative claim.

Negative Evidence Must Be Typed

There are several different kinds of absence.

not in surviving inventory;
explicitly recorded as not present;
known to have been loaned elsewhere;
inventory incomplete;
inventory only covers one property;
object did not yet exist.

These cannot all be scored equally.

Voynich research often treats absence as a binary variable when archival reality is conditional.

A Loan Creates a Temporary Provenance Edge

Provenance graphs usually privilege permanent ownership.

But temporary custody can be historically decisive.

During a loan, a manuscript may be:

annotated;
copied;
excerpted;
shown to students;
combined with another packet;
carried to another town;
used in clinical work.

The object can acquire intellectual descendants without changing legal owner.

This is exactly how source-packet transmission can escape the book that first carried it.

Copying Breaks the Ownership Chain Even More

If Dottori copied material from a Cermisone loan, the new copy would belong to a different object history from the source manuscript.

The knowledge relation becomes:

Cermisone manuscript → Dottori custody → excerpt/copy → Dottori or student manuscript.

Now the original can return to Cermisone while the derivative continues elsewhere.

This is why textual ancestry and physical provenance must be tracked separately.

Executors Create a Post-Mortem Movement Layer

Dottori named Polcastro and Savonarola as executors in 1428.

An executor is not merely a friend named in prose.

The role can include the legal execution of property distributions.

For books, this creates a new state transition:

living custody → death event → executor handling → beneficiary custody.

A manuscript may therefore pass through an executor’s hands without ever becoming that executor’s property.

Monastic Loans Give a Parallel Control

The Santa Giustina manuscript examined earlier in this series preserves another explicit loan relation.

Eusebius says he wrote the book for Theophilus and lent it to him.

The object later belonged to the congregation and was assigned to San Giorgio Maggiore in Venice.

Professional and monastic networks therefore share the same basic lesson:

a book’s user, holder, owner and institutional destination can be different actors.

Why the Missing Ownership Bridge May Be the Wrong Shape

The Voynich problem is usually phrased as:

Who owned the manuscript between the fifteenth century and Prague?

That is necessary.

It may not be sufficient.

We may instead need several types of edge:

owner;
borrower;
depositor;
executor;
heir;
institutional custodian;
temporary student user.

A manuscript can cross geography through custody without a formal sale or inheritance.

The Loan Model Produces Independent Predictions

If lending was an important route, we should find certain traces elsewhere in the Paduan archive.

testaments recalling borrowed books;
claims by heirs for books held by colleagues;
ownership notes contradicted by current location;
duplicate copies created during a loan;
student manuscripts derived from a professor’s book;
books returning to a family after years elsewhere.

These can be searched independently of Voynich.

The Model Also Has a Failure Condition

Loan mechanics cannot become a universal escape hatch.

If the relevant Paduan medical archives show very little book lending, or if securely reconstructed libraries prove tightly controlled and complete, then the explanatory value of the loan hypothesis falls.

Documented examples must determine the prior.

What the Dottori–Cermisone Loan Can Legitimately Support

books were explicitly lent between major Paduan physicians;
Dottori possessed books that legally belonged to Cermisone;
Dottori separately bequeathed some of his own books to Cermisone and Polcastro;
temporary custody can make inventories incomplete indicators of ownership;
executors and beneficiaries create additional movement states after death.

What It Cannot Support

that Voynich was a Cermisone loan;
that every missing inventory item was lent out;
that absence from the 1404 Carrara inventory is meaningless;
that Dottori copied every borrowed book;
that loan networks erase the need for a provenance chain.

The Book-Loan Search Protocol

Extract every explicit mutuo, loan, deposit and return reference from physician wills.
Build separate owner and holder fields for each book.
Record date intervals for temporary custody.
Search for derivative copies made during those intervals.
Trace executor and heir handling separately.
Re-score inventory absences according to whether the owner is documented as lending books.
Require an identifiable object before proposing a Voynich edge.

Research Sources

Continue the Series

The Final Idea

A book loan sounds small because no ownership changes hands.

For knowledge transmission, it can be enormous.

A manuscript can leave its owner, enter another physician’s working environment, be copied, cited, inherited around and later return. Provenance must follow possession as carefully as ownership.

Voynich and Padua | The Book-Loan Problem: Cermisone, Dottori and Manuscripts That Were Not Where Their Owners Were