Cecily appears to have been married to both husbands by 1361, when all her surnames, including maiden, are used in the multiple inquisitions after her brother's death. And, already a widow to both, as she appears to be handling her own affairs, with none of her inheritance being passed on to a husband.
1361:
"Cecily Turbervyll"
"Cecily Turberevyle"
"Cecily de Seymor"
"Cecily Beauchamp"
"Cecily de Beauchaump"
And, in 1364, 1366, 1367.
1364-1366:
"These are the fealties and homages belonging to the fees assigned to Lady Cecily de Turberville for her purparty in Somerset, Devon, Dorset:"
"Lady Cecily at Hacche Beauchamp"
"in the presence of William Seymour, Edmund his son" (brother-in-law and nephew)
"Lady Cecily de Turbervyle, lady of Hacch"
"Cecily de Turbervyle, one of the sisters and heirs of John de Beauchamp (de Bello Campo) of Somerset"
1365:
"222. Note concerning the default of Cecilia de Turberville to do suit or homage, 39 Ed. Ill [1365]."
4 Jul 1367:
"Cecily Turberville"
Does anyone know what primary source is being cited, for a later marriage date, by Complete Peerage?
And, why, if his profile is listing Richardson as a source, is the Gilbert she's attached to nothing like the Gilbert Richardson presents?