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James I of Aragon

«the Conqueror»

King of Aragon and a leading figure in the Crown of Aragon’s expansion. He conquered Majorca and Valencia and left a territorial and dynastic inheritance of decisive importance for the western Mediterranean.

1208 – 1276King of Aragon, Majorca and ValenciaBarcelona · ES
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Portrait of James I of Aragon
Historical portraitJames I the ConquerorAttributed to Jaume Mateu · Fifteenth centuryPublic domain · PD-Art / PDM 1.0 · Source
Biography

Life of James I of Aragon

A childhood in danger

The son of Peter II of Aragon and Maria of Montpellier, he was born in Montpellier in 1208. His father died at the Battle of Muret in 1213, and the child remained in the custody of Simon de Montfort, who handed him over to the Templars at Monzón on the pope’s orders. He governed amid rival noble factions until asserting his authority in the 1220s.

References: Real Academia de la Historia · Diccionario Biográfico español · Deutsche Biographie · Encyclopaedia Britannica

The Conqueror

In 1229 he landed on Majorca and captured its capital; Minorca became tributary in 1231, and Ibiza was conquered in 1235. From 1232 he directed the conquest of the Muslim Kingdom of Valencia, whose capital surrendered in 1238. He granted it its own laws and made it another kingdom of the Crown. In 1266 he helped Castile recover Murcia.

References: Real Academia de la Historia · Diccionario Biográfico español · Deutsche Biographie · Encyclopaedia Britannica

Borders and treaties

Under the Treaty of Corbeil in 1258 he renounced almost all his rights over Languedoc in exchange for Louis IX of France abandoning his claims over the Catalan counties. The Treaty of Almizra with Castile in 1244 fixed the Valencian frontier. He left a first-person chronicle, the Llibre dels fets, one of the great works of medieval Catalan prose.

References: Real Academia de la Historia · Diccionario Biográfico español · Deutsche Biographie · Encyclopaedia Britannica

The division of the inheritance

Married first to Eleanor of Castile and then to Violant of Hungary, he divided his states between his sons: Peter received Aragon, Catalonia and Valencia, and James the Kingdom of Majorca with Roussillon and Montpellier. He died in Alzira in 1276. This division created a Kingdom of Majorca that the Crown reabsorbed in 1343.

References: Real Academia de la Historia · Diccionario Biográfico español · Deutsche Biographie · Encyclopaedia Britannica

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: 22 February 1208 Documented

Death: 27 July 1276 Documented

Role: King of Aragon, Majorca and Valencia

Other recorded names: James the Conqueror

Dynasty: Barcelona · ES

Territories: Aragon (ES) · Majorca (ES) · Valencia (ES) · County of Barcelona (ES) · Montpellier (ES)

Recorded governments and reigns
King · Aragon · Reign Pending review1213–1276Effective rule
King · Majorca · Reign Pending review1231–1276Effective rule
King · Valencia · Reign Pending review1238–1276Effective rule
Count · County of Barcelona · County Pending review1213–1276Effective rule
Lord · Montpellier · Lordship Documented1213–1276Effective ruleHe inherited the lordship from his mother in 1213.
Family network

Recorded relationships

Parents
Partners
Children
Crowns and unions

Their titles over time

Follow the changing territories and offices of James I of Aragon. Each title retains its own status.

Governments in 1238

Annual dates: overlap within one year does not prove that two offices were held on the same day. Regencies and co-rulerships retain their labels.

Documentation

Sources for this profile

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

Evidence for this profile

10 recorded claims · 6 without a claim-specific source. Context references do not by themselves verify every fact.

Dates (2/2 with a precise source)
Family and relationships (1/3 with a precise source)
  • FatherDocumented

    Peter II of Aragon

    The authority record identifies Peter II of Aragon (GND 1018870210) as father.
    Deutsche Nationalbibliothek · GND · Jakob I., Aragonien, König · Relationships: father → GND 1018870210
    Reviewed on 2026-10-17 by El Árbol de Europa ·
  • MotherPending review

    Maria of Montpellier

    A precise source has not yet been added.
    No individual review recorded ·
  • Marriage or partnershipPending review

    Violant of Hungary

    A precise source has not yet been added.
    No individual review recorded ·
Governments (1/5 with a precise source)
Biographical and contextual references (3)
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.

Keep exploring

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