It was Eleanor of Provence who arranged a marriage between her sister Sanchia and her brother-in-law Richard, 1st Earl of Cornwall, whose first wife Isabel Marshal had died recently. At the time, Sanchia was engaged toRaymond VII of Toulouse, but the weak part he played in the recent fighting was a good enough excuse for breaking the bond. Eleanor and Sanchia's uncle Peter was sent to negotiate the marriage contract in 1242. Another uncle, Philip, escorted Sanchia safely to the English court in Gascony. There, they joined Eleanor and Henry, and met their new daughter Beatrice. The wedding took place at Westminster on November 23. Richard, although the wealthiest man in the Kingdom of England and perhaps in Europe, was only a prince, not a sovereign. Beatrice of Savoy, mother of the bride, came to England to see her third daughter wedded, but her father Ramon Berenguer IV was detained by state difficulties which his wife solved by getting a loan from Henry III of four thousand marks. The cost of the wedding was chiefly defrayed by a levy imposed on the Jews of the country. It was an arbitrary proceeding, each of them receiving notice of the size of the donation required. An idea of the extravagance of the festivities may be gleaned from the fact that thirty thousand dishes were prepared for the wedding dinner alone. The marriages of the royal brothers from France and England to the four sisters from Provence improved the relationship between the two countries, which led up to the Treaty of Paris. Sanchia was present, along with all her sisters and her mother.
Richard was elected in 1256 as King of Germany by a majority of the seven electoral princes, with the title of King of the Romans, a preparatory step in being named Holy Roman Emperor by the pope. In January 1257, the ambassadors bringing the news of Richard's election were received in a long hall where Richard and Sanchia were dining in considerable elegance and state. "Richard rose to hear what the men from Bohemia had to say and at the finish he burst into tears. He would accept the crown, he said, but it was not through greed or ambition. His sole object was to assist in restoring prosperity to the German states; his honest desire was to rule justly and well. It was clear to the German delegation, and to the throng of adherents and servants who swarmed into the hall to listen, that he was happy over the fulfillment of his great wish. It must have been quite apparent also that Sanchia was delighted beyond measure. Now she would be a queen as well as her two older and patronizing sisters." Sanchia was crowned Queen of the Romans with her husband on 27 May 1257 at Aachen Cathedral in Germany. She and her husband then spent fifteen months traveling in the area near Mainz. They hurriedly traveled back to England when the political situation deteriorated there. Sanchia grew ill in the autumn of 1260 and died a year later, with her son Edmund present.
Richard also had a son, named Richard, by his mistress Joan de Valletort who is sometimes mistakenly called son of Sanchia. Sanchia died 9 November 1261 at Berkhamsted Castle and was buried 15 November in Hailes Abbey.
