The Vincentii Bellovacensis Memoriale Omnium Temporum records the marriage in 1233 of King Louis IX and "comitis Provincie filiam…Margaretam". "R Berengarii…comes et marchio Provincie et comes Folcalquerii" made arrangements for the dowry of "filie nostre Margarite" by charter dated 17 May 1234.
She was consecrated Queen 28 May 1234, Cathedral of St Etienne, Sens. The testament of “R. Berengarius…comes et marchio Provincie et comes Forcalquerii”, dated 20 Jun 1238, names “Margaritam filiam nostrum…reginam Francie…Elionors filiam nostrum…reginam Anglie…Sanciam filiam nostram” and appoints “Beatricem filiam nostrum heredem generalem”. After disputing the succession of her youngest sister Béatrice to the county of Provence, she renounced her rights in 1287 and received Beaufort and Baugé. The testament of "Beatricis relictæ Raimundi Berengarii comitis Provinciæ", dated 14 Jan 1264, confirms her previous testaments appointing "Reginarum filiarum suarum Margarethæ Franciæ et Alienoræ Angliæ…" as her heirs.
The Chronicle of Guillaume de Nangis records the death in Paris in 1295 of "regina Franciæ Margareta" and her burial "in ecclesia sancti Dionysii in Francia juxta regem sanctissimum Ludovicum conjugem suum", adding that she had retired to "Parisius apud sanctum Marcellum cœnobium sororum minorum". 1
Margaret Of Provence, French Marguerite De Provence... Although Blanche of Castile, Louis IX’s mother, had arranged the marriage, she was jealous of her daughter-in-law, whom she supervised strictly; Jean, Sire de Joinville, chronicler of Louis’s reign, tells several stories of Blanche separating the royal couple, and Louis himself sometimes behaving brusquely toward Margaret.
Margaret accompanied Louis to Egypt on the crusade of 1248 and showed great courage at Damietta, reinspiring the crusaders after a defeat at al-Man?urah (February 1250), where Louis was captured by the Muslims. Blanche died in 1252; and Margaret, after returning to France, tried occasionally to meddle in politics. Though she was usually checked by the King’s intransigence, she may have done something to improve relations between Louis and Henry III of England, who in 1236 had married her sister Eleanor. On the other hand, she resented the fact that her father (died 1245), by his will of 1238, left Provence to her youngest sister, Beatrice, who in 1246 was married to Charles of Anjou, a brother of Louis IX. After Louis IX’s death (1270) Margaret did all she could to thwart Charles’s ambitions.