Question: What is the date of death of Alfonso Pérez De Guzmán, 5Th Duke Of Medina Sidonia's father?

Knowledge 1: Alfonso Pérez de Guzmán, 5th Duke of Medina Sidonia
Alfonso Pérez de Guzmán y de Guzmán-Zúñiga, 5th Duke of Medina Sidonia (d. 1549) was the son of Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia and became Duke of Medina Sidonia in 1512 when his half brother, Enrique Pérez de Guzmán, 4th Duke of Medina Sidonia died childless.Declared "impotent and stupidmentecato", in 16th-century Spanish language) by King Charles I of Spain in 1518, his wife Ana de Aragón was the daughter of Alonso de Aragón, Archbishop of Zaragoza, the illegitimate son of Ferdinand II of Aragon.After the 5th duke's death, his widow married his brother Juan Alfonso, the 6th Duke. [SEP] Knowledge 2: Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia
Don Juan Alfonso Pérez de Guzmán y Afán de Ribera, 3rd Duke of Medina Sidonia (February 1464 – 1507) inherited the title in 1492, aged 28.In 1502, as Gibraltar was transferred to the Crown, the Marquisate of Gibraltar disappeared.His mother is known as Leonor de Mendoza y Ribera, although he was known by using as his second name "Afan de Ribera".This could be because his mother was a Mendoza and it was not unknown for women and ecclesiastics to use the name of their mother, in spite of her father being an "Afan de Ribera".He married twice, being the father of the 4th, 5th and 6th Duke.Among his children were:
Knowledge 1: Alfonso Pérez de Guzmán, 5th Duke of Medina Sidonia
Alfonso Pérez de Guzmán y de Guzmán-Zúñiga, 5th Duke of Medina Sidonia (d. 1549) was the son of Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia and became Duke of Medina Sidonia in 1512 when his half brother, Enrique Pérez de Guzmán, 4th Duke of Medina Sidonia died childless.Declared "impotent and stupidmentecato", in 16th-century Spanish language) by King Charles I of Spain in 1518, his wife Ana de Aragón was the daughter of Alonso de Aragón, Archbishop of Zaragoza, the illegitimate son of Ferdinand II of Aragon.After the 5th duke's death, his widow married his brother Juan Alfonso, the 6th Duke. [SEP] Knowledge 2: Juan Alfonso Pérez de Guzmán, 6th Duke of Medina Sidonia
Juan Alfonso Pérez de Guzmán y de Guzmán-Zúñiga, 6th Duke of Medina Sidonia (24 March 1502 – 26 November 1558) was the son of Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia, half brother of Enrique Pérez de Guzmán, 4th Duke of Medina Sidonia, and the brother of Alfonso Pérez de Guzmán, 5th Duke of Medina Sidonia.Upon his brother's death in 1549, he became Duke of Medina Sidonia.In 1518 he married his brother's wife, Ana de Aragón (d. 1528), daughter of Alonso de Aragón, and had issue:
As Don Juan Carlos predeceased his father in 1556, the title passed to his eldest son Alonso Pérez de Guzmán, 7th Duke of Medina Sidonia.
Knowledge 1: Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia
Don Juan Alfonso Pérez de Guzmán y Afán de Ribera, 3rd Duke of Medina Sidonia (February 1464 – 1507) inherited the title in 1492, aged 28.In 1502, as Gibraltar was transferred to the Crown, the Marquisate of Gibraltar disappeared.His mother is known as Leonor de Mendoza y Ribera, although he was known by using as his second name "Afan de Ribera".This could be because his mother was a Mendoza and it was not unknown for women and ecclesiastics to use the name of their mother, in spite of her father being an "Afan de Ribera".He married twice, being the father of the 4th, 5th and 6th Duke.Among his children were: [SEP] Knowledge 2: Juan Alfonso Pérez de Guzmán, 6th Duke of Medina Sidonia
Juan Alfonso Pérez de Guzmán y de Guzmán-Zúñiga, 6th Duke of Medina Sidonia (24 March 1502 – 26 November 1558) was the son of Juan Alfonso Pérez de Guzmán, 3rd Duke of Medina Sidonia, half brother of Enrique Pérez de Guzmán, 4th Duke of Medina Sidonia, and the brother of Alfonso Pérez de Guzmán, 5th Duke of Medina Sidonia.Upon his brother's death in 1549, he became Duke of Medina Sidonia.In 1518 he married his brother's wife, Ana de Aragón (d. 1528), daughter of Alonso de Aragón, and had issue:
As Don Juan Carlos predeceased his father in 1556, the title passed to his eldest son Alonso Pérez de Guzmán, 7th Duke of Medina Sidonia.

Answer: 1507