 In 1087, long after the deaths of Ferdinand (1065) and Sancha (1067), their eldest daughter, Urraca, referred to herself as "daughter of that king and emperor Ferdinand and Empress Sancha" ("filia ejusdem regis et imperatoris Federnandi et Sancie imperatricis").The fourth wife of Alfonso VI, Isabel (Elizabeth), probably of French or Burgundian origin, appears in contemporary charters as his "empress".On 14 May 1100 Alfonso issued his first act with her at his side