General Notes

Richmond, previous creations: Geoffrey and Constance's son Arthur, better known as the Prince who was probably done away with by King John, succeeded to the Earldom of Richmond and Dukedom of Brittany.  Arthur had a sister Eleanor, who long outlived him, but the next holder of the Earldom of Richmond to be recognized as such was the husband of his niece of the half-blood, Piers de Braine.  The latter had married Alice, daughter of Constance by her third husband Guy de Thouars, and had seisin of the Richmond property from January 1218/9, thus becoming its fully fledged Earl, the 1st such of this creation.  Not that he enjoyed uninterrupted tenure.  He was deprived of his lands (hence the Eardom too according to the system then in force) in 1224, from 1227 to 1229 and again in early 1235.  [Burke's Peerage, p. 2402]

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He [Piers de Braine] married, 1stly, in February 1212/3, Alice, elder daughter and coheir of Guy DE THOUARS, sometime DUKE OF BRITTANY, by Constance, DUCHESS OF BRITTANY. She died 21 October 1221, and was buried in the convent of the Cordeliers at Nantes.  [Complete Peerage X:800-5, (transcribed by Dave Utzinger)]