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Primary sourceDocument1502

Safe-Conduct from Cesare Borgia

Cesare Borgia · 1502

A 1502 document from Cesare Borgia naming Leonardo da Vinci his architect and general engineer with authority over his fortresses.

An official document showing Leonardo's formal role as military engineer under Cesare Borgia.

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A handwritten document in Italian issued by Cesare Borgia, granting Leonardo da Vinci safe passage and authority as his engineer.
Cesare Borgia, Safe-Conduct for Leonardo da Vinci, 1502. Archivio Melzi d'Eril, Vaprio d'Adda.

About this source

What it is

This is a safe-conduct document issued in 1502 by Cesare Borgia, held in the Archivio Melzi d'Eril.

Why it matters

The document names Leonardo da Vinci as Borgia's architect and general engineer, giving him full authority over his fortresses. It shows the trust and power Leonardo held in this role, beyond his fame as a painter, and connects him directly to the politics of Renaissance Italy.

Look closer

  • Why would Cesare Borgia need to give Leonardo an official document like this?
  • What does the title "general engineer" suggest about the range of Leonardo's responsibilities?
  • What does this document not tell us about the actual work Leonardo carried out?

This document is part of the curated material that grounds the AI version of Leonardo da Vinci on Humy.ai — when students ask about related events, the AI can quote it and cite it.

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