Zaida was the daughter of unknown parents. The date and place of her birth have not been found.
She had two marriages/partners. Her first husband was Abu al Fatah al Ma'Mun, who she married in BEF 1091. The place has not been found. They had no known children.
Her second husband was Alphonse VI de Castilla, who she married in 1093. The place has not been found. Their two known children were Sancho Alfónsez (c1093-1108) and Sancha Alfónsez (1101-c1125).
Note 1
She was the mother of Alfonso VI of Castile's only son, Sancho, who, though illegitimate, was named his father's heir but was killed in the Battle of Uclés of 1108 during his father's lifetime. It has been suggested that Alfonso's fourth wife, Isabel, was identical to Zaida, but this is still subject to scholarly debate, others making Queen Isabel distinct from the mistress or suggesting that Alfonso had two successive wives of this name, with Zaida being the second Queen Isabel. Alfonso's daughters Elvira and Sancha, were by Queen Isabel, and hence may have been Zaida's