King Fernando IV 'The Summoned' of Castile and Queen Constança

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Fernando IV El Emplazado or "the Summoned," King of Castile and León (Seville, 6 December 1285 – Jaén, 7 September 1312) ; married in Valladolid on 23 January 1312 Princess Constança of Portugal (?, 3 January 1290 - Sahagún, 18 November 1313)

Dynasty: Burgundy

Reign: 1295 - 1312

Predecessor: King Sancho IV of Castile and León

Successor: King Alfonso XI of Castile and León

Children: Queen Leonor of Aragon; Princess Constanza of Castile and King Alfonso XI of Castile

Parents Fernando: King Sancho IV of Castile and León and Princess Maria of León (Molina)

Parents Constança: King Diniz of Portugal and Princess Isabel of Aragon

Siblings Fernando: Queen Isabel of Aragon, later Duchess of Brittany; Prince Alfonso, Prince Enrique, Prince Pedro and Prince Felipe of Castile; and Queen Beatriz of Portugal

Brother Constança: King Alfonso IV of Portugal

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The wikipedia article on Fernando IV can be found here:

Ferdinand IV, El Emplazado or "the Summoned," (December 6, 1285 – September 7, 1312) was a king of Castile (1295 - 1312). He was a son of Sancho El Bravo and his wife Maria de Molina.

His strange title is given him in the chronicles on the strength of a story that he put two brothers of the name of Carvajal to death tyrannically, and was given a time (plazo) by them in which to answer for his crime in the next world. But the tale is not contemporary, and is an obvious copy of the story told of Jacques de Molay, grand-master of the Temple, and Philippe Le Bel.
His minority was a time of anarchy. He owed his escape from the violence of competitors and nobles, partly to the tact and undaunted bravery of his mother Maria de Molina, and partly to the loyalty of the citizens of Ávila, who gave him refuge within their walls. As a king he proved ungrateful to his mother, and weak as a ruler.
In 1302 he married Constance, daughter of King Denis of Portugal. Their children were:

1. Leonor (1307-1359), married King Alfonso IV of Aragon.
2. Constanza (1308-1310)
3. Alfonso XI of Castile (1311-1350)

He captured Gibraltar in 1309, with the help of Aragón. He died suddenly in his tent at Jaén when preparing for a raid into the Moorish territory of Granada, on September 7, 1312.

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From the wikipedia article here.

Infanta Constança of Portugal (English: Constance, pron. IPA: [kõʃ'tɐ̃sɐ]) was a Portuguese infanta, daughter of King Denis of Portugal. She was born on January 3, 1290 and became Queen consort of Castile when she married Castilian King Ferdinand IV.
From Ferdinand IV she had three children:

• Leonor (1307-1359), married King Alfonso IV of Aragon
• Constanza (1308-1310)
• Alfonso XI of Castile (1311-1350)

Constance of Portugal died November 18, 1313.