Voynich and Padua | Sigismondo Polcastro: Dottori’s Book Heir

Sigismondo Polcastro gives the Voynich–Padua investigation something more useful than another famous physician.

He gives us a younger Paduan doctor who sits immediately downstream of Cermisone’s generation, receives books from Stefano Dottori, teaches natural philosophy and medicine for decades, serves Venetian elites, writes technical medical questions and then establishes another medical family inside Padua.

“Book heir” here has a deliberately narrow meaning: Dottori’s 1428 testament left some of his books to Polcastro. Polcastro was not Dottori’s universal heir.

That distinction matters because provenance is strongest when every relationship is typed correctly.

Quick Read

Sigismondo Polcastro was probably born in Vicenza in 1384 but moved to Padua while still young.
He received the arts degree at Padua on 13 October 1412 and the medical degree before 1424.
He taught ordinary natural philosophy from at least 1422 to 1426 before moving into theoretical medicine.
From 1426–27 onward he held major Paduan medical teaching posts for decades.
Treccani groups Polcastro with Stefano Dottori and Michele Savonarola among the active younger Paduan physicians shaped by Cermisone’s teaching and practice.
Dottori’s 1428 testament left part of his books to Cermisone and Polcastro; Dottori also named Polcastro and Savonarola as executors.
Polcastro later became an influential physician with strong standing under Venetian government and among Venetian nobles.
His works include questions on medicines, bodily balance and restoration, commentaries on Galen and Hippocrates, and treatises on fevers and poisons.
He died in 1473 without a testament, creating a later inheritance dispute among his sons.
This gives us a real chain in which medical books, teaching and family status persist well beyond the 1404–1438 Voynich parchment window.

Why Polcastro Is the Right Next Generation

The earlier Padua articles concentrated on the masters visible around 1405–1420.

Polcastro changes the time scale.

He is young enough to be trained inside the re-hosted Venetian university system and old enough to carry that medical culture through the middle decades of the fifteenth century.

He therefore helps answer a different question:

If a Paduan medical-technical packet existed around the Voynich window, what professional network remained alive long enough to preserve, lend, inherit, excerpt or recopy it?

1412: The Arts Degree Comes First

Polcastro followed the normal Paduan progression through arts and medicine.

Treccani records his arts degree on 13 October 1412.

This places him in the same broad educational system already reconstructed through Dottori, Savonarola, Pelacani and Della Torre.

The path matters because medical expertise does not begin with the medical doctorate.

Natural philosophy and arts training are part of the intellectual stack.

Natural Philosophy Is His First Major Teaching Layer

From at least 1422 to 1426, Polcastro held the ordinary chair of natural philosophy.

That is a useful reminder that the later physician spent years formally teaching the physical-philosophical layer beneath medicine.

The career path is therefore:

arts → natural philosophy → medicine.

This is precisely the integrated educational environment the series has been reconstructing.

Medicine Before 1424

Treccani states that Polcastro obtained his medical degree before 1424.

Within a short time he moved from natural philosophy into theoretical medicine.

By 1426–27 he held the extraordinary chair of theoretical medicine, a position he retained until 1439 before advancing further.

Thus the exact Voynich period contains Polcastro not simply as a student but as an active university teacher.

Cermisone Is the Generational Anchor

Treccani places Polcastro together with Dottori and Savonarola among the younger Paduan doctors closely tied to Cermisone’s teaching and practical medicine.

This gives the network a generational form.

older clinical authority: Cermisone;
younger professional generation: Dottori, Savonarola, Polcastro;
later descendants and students: another generation extending into the later fifteenth century.

A manuscript packet does not need to survive because one owner guards it for fifty years.

It can survive because a professional network keeps finding it useful.

1428: Dottori’s Testament Creates a Direct Book Edge

This is the most important event for the article.

In his first testament of 1428, Stefano Dottori left part of his books to Cermisone and part to Sigismondo Polcastro.

Dottori also stated that some books in his possession had been borrowed from Cermisone.

And he appointed Polcastro and Savonarola as executors.

The result is an unusually rich cluster of typed relations:

Cermisone → lender;
Dottori → borrower and testator;
Polcastro → book beneficiary and executor;
Savonarola → executor.

This is manuscript circulation embedded directly inside friendship and professional practice.

Why “Book Heir” Must Stay Narrow

It would be wrong to say Polcastro inherited Dottori’s library.

The source says Dottori left part of his books to Cermisone and Polcastro.

That is enough.

For provenance, even one identified manuscript moving through a testament can be more valuable than a hundred pages of contextual similarity.

specific partial inheritance > vague library association.

Executorship Is a Different Kind of Access

Polcastro’s role as executor matters independently of the books he received.

An executor can handle a household’s property, obligations and distribution.

That does not prove personal reading of every manuscript.

It does establish a legal mechanism through which books can be inspected, assigned and transferred after death.

This is exactly the kind of mundane mechanism a missing manuscript history needs.

Polcastro’s Medical Works Are Technically Revealing

Treccani records several surviving or reported works.

De actuatione medicinarum;
De extremis temperantie;
De corporum reductione;
De appropinquatione ad equalitatem ponderalem;
De restauratione humidi substantifici;
commentaries on Galen;
commentaries on Hippocrates’ Aphorisms;
treatises on fevers;
treatises on poisons and their recognition.

Several titles are explicitly about balance, restoration, medicine action and bodily states.

They reinforce the importance of process and state transition in Paduan medicine.

A Later Printed Witness Shows the Question Tradition Survived

The University of Iowa’s Heirs of Hippocrates catalogue describes a 1490 printed edition of Polcastro’s question on the restoration of bodily moisture.

The catalogue notes discussion of bodily fluids, diagnostic and therapeutic principles and case material.

This is later than Voynich.

Its relevance is survival.

A university question can move from lecture and manuscript culture into print at the end of the century.

Venetian Government Strengthens Rather Than Erases His Career

Polcastro’s later career flourished under Venetian rule.

Treccani records his strong standing with the Venetian government and his work as physician to lagoon nobility.

By the 1440s he held prestigious teaching privileges and salaries.

This is another demonstration that the 1405 regime change did not end Paduan medical capability.

Property Builds Another Kind of Archive

Polcastro also accumulated substantial property across the Paduan district.

This may sound irrelevant to manuscripts.

It is not.

Property creates:

notarial records;
household inventories;
inheritance disputes;
family archives;
legal documentation of movable goods.

Those are exactly the documentary classes that can preserve otherwise invisible book histories.

1473: Polcastro Dies Without a Testament

Polcastro’s death creates the inverse of Dottori’s 1428 clarity.

He died in 1473 without making a will.

A dispute followed between his sons over the intended structure of the inheritance.

This is a provenance lesson in itself.

When a testament survives, books may become traceable. When it does not, an object can vanish into ordinary family succession.

The Family Continues the Academic Line

Polcastro’s sons Girolamo and Antonio later entered the university world, with Girolamo building a substantial academic career.

The medical-intellectual household therefore becomes another multi-generational Padua family.

This matters because manuscript custody can move through domestic inheritance before reappearing in institutional collections decades later.

What Polcastro Can Legitimately Support

A younger physician trained inside the post-1405 Paduan system became a major teacher.
Polcastro belonged to the Cermisone-influenced circle with Dottori and Savonarola.
Dottori explicitly left some books to Polcastro in 1428.
Polcastro also served as one of Dottori’s executors.
His medical works and family extended the Paduan intellectual network into later decades.
His death without a will illustrates how a later library trail can become difficult.

What It Cannot Support

that Polcastro received Dottori’s entire library;
that any Dottori book was the Voynich Manuscript;
that Polcastro owned or saw Beinecke MS 408;
that family succession explains Voynich’s later provenance;
that a medical network is itself a manuscript identification.

The Polcastro Search Protocol

Identify all surviving Dottori testamentary records.
Extract every book beneficiary and loan statement.
Reconstruct Polcastro household inventories and inheritance litigation after 1473.
Search manuscripts of Polcastro’s works for ownership and student annotations.
Trace his sons’ libraries separately.
Record negative evidence before assigning any Voynich relevance.

Research Sources

Continue the Series

The Final Idea

Polcastro shows what happens after a medical generation becomes a network.

Books move through friendship and wills; teaching moves through chairs; medical method moves through students; property creates family archives. If a missing Voynich bridge exists in Padua, this ordinary machinery is more promising than another resemblance.

Voynich and Padua | Sigismondo Polcastro: Dottori’s Book Heir and the Next Paduan Medical Generation