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Denis of Portugal

King of Portugal from 1279 to 1325

  • 14 min read
  • 9 chapters

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Denis was the eldest son of Afonso III of Portugal by his second wife, Beatrice of Castile, and grandson of Afonso II of Portugal. Denis succeeded his father in 1279. He was married to Elizabeth of Aragon, who was later canonised as a saint of the Roman Catholic Church.

Denis ruled Portugal for over 46 years. He worked to reorganise his country's economy and gave an impetus to Portuguese agriculture. He ordered the planting of a large pine forest (that still exists today) near Leiria to prevent soil degradation that threatened the region, and to serve as a source of raw materials for the construction of the royal ships. He was also known for his poetry, which constitutes an important contribution to the development of Portuguese as a literary language.

Early life and background

Born on 9 October 1261 in Lisbon, Denis was the eldest son of Afonso III of Portugal and Beatrice of Castile, an illegitimate daughter of King Afonso X of Castile. Beatrice and Afonso were married c. 1253 to settle a dispute regarding the sovereignty of the Algarve. Afonso III agreed to temporarily abdicate his rights over the Algarve and lands east of Guadiana until his first-born son with Beatrice was seven. At the time of the wedding, Afonso was still married to Matilda II of Boulogne, who, in 1255, accused her husband before Pope Alexander IV of bigamy. In 1258, the Pope condemned Afonso III for adultery and placed him under interdict. Alexander IV's successor, Pope Urban IV, finally legitimized Denis and his siblings in 1263.

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