• General Notes

  Secondly he married, on 23 November 1243 at Westminster Abbey, Sanchia of Provence (c.1225 – 9 November 1261), daughter of Raymond, Count of Provence by his wife Beatrice of Savoy, by whom he had two sons:[8]
  unnamed son, (born July 1246, died 15 August 1246).
  Edmund, 2nd Earl of Cornwall (c. 1 January 1250 – c. 25 September 1300), usually styled Edmund of Almain, who married Margaret de Clare (born 1250, died shortly before November 1312), daughter of Richard de Clare, Earl of Gloucester, by his second wife, Maud de Lacy, daughter of John de Lacy, 2nd Earl of Lincoln. They had no issue, and the marriage was dissolved in February 1294.

Details of Sancha's family with Richard Plantagenet (Earl of Cornwall)