Don Fadrique Alvarez de Toledo, Duke of Alva (1537-1583) was a commander in the Spanish army during the Eighty Years' War.
He was the second son of Fernando Álvarez de Toledo, Duke of Alva, and he became the fourth Duke of Alva after his father's death. His was Duke of Huesca, Marquess of Coria and Comendador Mayor in the Order of Calatrava.
Don Fadrique, was commander of the Spanish troops during the most bloody fase of the war in the Netherlands. He was in charge during the slaugthering in Mechelen, Zutphen and Naarden, as well as during the Siege of Haarlem.
His army failed in the siege of Alkmaar, and he had to retreat. His father the Duke did not approve of that -- he was afraid of his son's reputation that was already not good with Philip II of Spain, their King.
Don Fadrique's health detoriated after 1573.
