Isabel Vieira Machado 
Isabel Vieira's father was Pedro Lourenço Machado I and her mother was Catarina Dias Vieira. Her paternal grandparents were Afonso Lourenço and Marqueza Gonçalves Machado Ribeira Seca; her maternal grandparents were Diogo Álvares Vieira and Beatriz Eanes Camacho. She had three brothers and three sisters, named Francisco Pires, Gaspar Lourenço, João, Bárbara Dias Vieira, Margarida Vieira and Maria Vieira.
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