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In October 1254 aged just 15, he married Eleanor (Leonor), daughter of Ferdinand III, King of Castile and Leon, at Las Huelgas. It was a love match and the couple were inseparable until her death. They had four sons, including Edward II, and eleven daughters. Many of these died young of whom John, Henry, Alphonso, Joan and Berengaria, were buried in the Abbey. Also buried in the Abbey is daughter Eleanor, Countess of Bar (1264-1298, who was married to Henri III, Count of Bar) but she has no marker. Joan of Acre (the second Joan in the family) married Gilbert de Clare in the Abbey in 1290. Margaret married the Duke of Brabant, Mary became a nun at Amesbury and Elizabeth married secondly Humphrey de Bohun. Julian, Alice, Beatrice and Blanche were the other daughters who died young.
His second wife was Margaret (died 1317), daughter of Philip III, King of France, and they were married at Canterbury cathedral in 1299. They had three children - Thomas, Earl of Norfolk, Edmund, Earl of Kent and Eleanor who died young.
https://www.westminster-abbey.org/abbey-commemorations/royals/edward-i-and-eleanor-of-castile
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27. EDWARD I, "Longshanks", King of England, 1307-1327; b. Westminster, 17-18 June 1239; d. 7 or 8 July 1307; crowned 19 Aug. 1274; m. (1) 18 Oct. 1254, (he age 15, she age 10) ELEANOR OF CASTILE (110-30), b. 1241, d. 1290; M. (2) 8 Sept. 1299 MARGUERITE OF FRANCE (155-30) CCP V; 69B, 707, 736; Don Stone, Some Ancient and Medieval Descents...' Chart 11, note 4, CCN, 353, DNB 17; 14, 178).

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They had 15 or 16 children.