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Signature of Isabella I of Castile

Isabella I of Castile

Isabella's personal autograph signature, 'Yo la Reina' (I the Queen), used to authorize royal acts.

Her own handwritten signature, used to personally authorize acts of state as queen.

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Close crop of an aged parchment page showing a brown-ink flourished handwritten signature beneath a line of cramped cursive writing above it.
Signature of Isabella I of Castile, 'Yo la Reina'.

About this source

What it is

This image shows a close-up of Isabella I of Castile's handwritten signature on an aged parchment document, with her flourished autograph beneath a line of cursive writing.

Why it matters

The phrase 'Yo la Reina' ('I the Queen') was how Isabella personally marked documents as authorized acts of state. As queen in her own right, her signature carried full legal weight, showing how she exercised direct royal authority rather than ruling only through her husband Ferdinand.

Look closer

  • What does the way the signature is written tell you about how confident or practiced Isabella was at writing her name?
  • Why might a ruler need to sign documents personally rather than let officials sign for her?
  • What is missing from this close-up crop that might help us understand the whole document?

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

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Scan of a handwritten Spanish manuscript page in old script, with signatures below the text, a wax seal impression on a diamond-shaped paper flap at lower right, and additional scribbled signatures at lower left.Document

Primary source

Alhambra Decree

Isabella I of Castile and Ferdinand II of Aragon · 31 March 1492

Open bound register showing two manuscript pages of handwritten Spanish legal text in brown ink on aged parchment, with a signature and date line near the top right of the right page. Dark background surrounds the book.Document

Primary source

Capitulations of Santa Fe

Catholic Monarchs · 17 April 1492

Photograph of a handwritten manuscript page in brown and black ink in Gothic-style script, with decorated illuminated capital letters at the top and middle. Blue circular library stamps reading Lisboa and Biblioteca Nacional appear at the top and bottom, along with a handwritten shelfmark and signatures at the bottom.Document

Primary source

Treaty of Tordesillas

7 June 1494

Document

Primary source

Testament of Isabella I of Castile

Isabella I of Castile · 12 October 1504

Painted portrait of a woman against a dark background, shown from the shoulders up. She wears a white veil covering her head, a white embroidered blouse with black patterned stripes, and a dark gown. A gold cross pendant hangs from a pearl-edged ornament at her chest. Her blue eyes look directly forward.Painting

Primary source

Portrait of Isabella the Catholic

Juan de Flandes · c. 1500

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