Family: Earl Richard Earl of Cornwall, King of Germany; King of Rome; Rex Romanorum, 1st Earl of Cornwall [4th creation (1225)] / Sanchia of Provence, Countess of Cornwall; Regina Romanorum (Queen of the Romans) (F3373)
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Male
Earl Richard Earl of Cornwall, King of Germany; King of Rome; Rex Romanorum, 1st Earl of Cornwall [4th creation (1225)]
Birth 5 Jan 1209 Berkhamsted Castle, Berkhamsted, Hertfordshire 
Death 2 Apr 1272 Burial Abt 2 Apr 1272 Hailes Abbey, Hailes, Gloucestershire 
Marriage 23 Nov 1243 [1] Westminster, London [1] 
Other Spouse Isabel Marshal/DE CLARE/PLANTAGENENT | F3372 Marriage Mar 1231 Father John, King of England | F4253 Group Sheet Mother Isabelle d’Angouleme | F4253 Group Sheet
Female
Sanchia of Provence, Countess of Cornwall; Regina Romanorum (Queen of the Romans)
Birth c. 1227 Death 9 Nov 1261 Berkhamsted Castle, Berkhamsted, Hertfordshire 
Burial 15 Nov 1261 Hailes Abbey, Hailes, Gloucestershire 
Father Mother
Male
Richard of Cornwall
Birth Jul 1246 Death 15 Aug 1246 Burial Abt 15 Aug 1246 Hailes Abbey, Hailes, Gloucestershire 
Male
Edmund of Almain, 2nd Earl of Cornwall
Birth 26 Dec 1249 Berkhamsted Castle, Berkhamsted, Hertfordshire 
Death Abt 25 Sep 1300 Burial Abt 25 Sep 1300 Ashridge Priory, Ashridge, Hertfordshire 
Spouse Margaret s of Gilbert de Clare de Clare | F3374 Marriage 6 Oct 1272
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Sources - [S37] Wikipedia (Reliability: 3).
Countess of Cornwall
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. Richard, although not a sovereign, rather a royal prince, was the wealthiest man in the Kingdom of England and perhaps in Europe. Sanchia was engaged to Raymond VII of Toulouse, but the weak part he played in recent fighting with the king of France 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 Sanchia's sister Eleanor and her husband Henry III of England and met their new daughter Beatrice. The wedding took place at Westminster on 23 November.[2] 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.
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.
The marriages of the kings of France and England and two of their brothers to the four sisters from Provence improved the relationship between the two countries that led to the conclusion of the Treaty of Paris in 1259.[3] Sanchia was present for the signing of the treaty, along with all of her sisters and her mother.
https://en.wikipedia.org/wiki/Sanchia_of_Provence#Countess_of_Cornwall
- [S37] Wikipedia (Reliability: 3).

