The Tree of Europe · Person

Bona Sforza

The daughter of Gian Galeazzo Sforza and Isabella of Aragon married Sigismund I of Poland in 1518. She influenced the court in Kraków and returned to her Duchy of Bari in 1556, where she died.

1494 – 1557ConsortSforza

Explore this family · Spanish Atlas Back to people

Contemporary portraitBona SfortiaWorkshop of Lucas Cranach the Younger · Sixteenth centuryMuzeum Czartoryskich / Wikimedia CommonsPublic domain · PDM 1.0 · Source

This complete profile is available in English. Bibliographic titles retain their original language. Links marked ES open the Spanish edition.

Historical profile

Key details

Birth: 2 April 1494 Documented

Death: 19 November 1557 Documented

Role: Consort

Dynasty: Sforza

Territories: Poland (ES)

Family network

Recorded relationships

Parents

Gian Galeazzo SforzaDocumentedIsabella of Naples · ESPending review

Partners

Sigismund I JagiellonDocumented

Children

Sigismund II AugustusAnna JagiellonCatherine JagiellonIsabella Jagiellon · ES

Documentation

Sources for this profile

Biographical and contextual references in their original language. Sources and methodology.

Evidence for this profile

5 recorded claims · 1 without a claim-specific source. Context references do not by themselves verify every fact.

Dates (2/2 with a precise source)

BirthDocumented
2 April 1494
The authority record gives the birth as 1494-04-02.
Deutsche Nationalbibliothek · GND · Bona, Polen, Königin · Vital data: birth date
Reviewed on 2026-10-17 by El Árbol de Europa ·
DeathDocumented
19 November 1557
The authority record gives the death as 1557-11-19.
Deutsche Nationalbibliothek · GND · Bona, Polen, Königin · Vital data: death date
Reviewed on 2026-10-17 by El Árbol de Europa ·

Family and relationships (2/3 with a precise source)

FatherDocumented
Gian Galeazzo Sforza
The authority record identifies Gian Galeazzo Sforza (GND 129069930) as father.
Deutsche Nationalbibliothek · GND · Bona, Polen, Königin · Relationships: father → GND 129069930
Reviewed on 2026-10-17 by El Árbol de Europa ·
MotherPending review
Isabella of Naples
A precise source has not yet been added.
No individual review recorded ·
Marriage or partnershipDocumented
Sigismund I Jagiellon
The authority record identifies Sigismund I Jagiellon (GND 118797158) as spouse.
Deutsche Nationalbibliothek · GND · Bona, Polen, Königin · Relationships: spouse → GND 118797158
Reviewed on 2026-10-17 by El Árbol de Europa ·

Biographical and contextual references (2)

Editorial history

2026-10-12 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
2026-10-08 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
2026-10-04 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
2026-10-04 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
2026-10-03 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.
2026-09-30 · The duchy is limited to Dijon and Autun; each other fief now enters the map only under its dated ruler. John III of Namur and the Nevers/Rethel branch were added. The previous shape combined later counties and unrelated lands as if all belonged to the duchy from 1363.
2026-09-28 · Claim registry added; existing historical data kept. Specific sourcing remains to be reviewed.

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