Alonso de Guzmán y Sotomayor

Alonso de Guzmán y Sotomayor, 7th Duke of Medina Sidonia, was a Spanish aristocrat appointed to command the 1588 Spanish Armada against England.

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Spanish Armada: The fleet sent by Philip II of Spain to invade England in 1588. Guzmán led this campaign, whose failure defined his naval reputation.
Álvaro de Bazán: A Spanish admiral and marquis of Santa Cruz who planned the Armada invasion but died before it sailed. Bazán's experience and original command role highlight the circumstances of Guzmán's appointment.
Spanish Netherlands: The Habsburg-ruled provinces in the Low Countries during the sixteenth and seventeenth centuries. The Armada was meant to link with troops stationed there before crossing to England.
Anglo-Spanish War (1585–1604): A prolonged conflict between England and Spain from 1585 to 1604, fought across Europe and the Atlantic. The Armada was a major episode in this broader war, which continued after its defeat.
Battle of Gravelines: The 1588 naval battle in which English attacks disrupted the Spanish fleet near the Flemish coast. The battle forced the Armada away from its planned rendezvous with Spanish forces in the Netherlands.
Alexander Farnese, Duke of Parma: A Spanish governor and military commander in the Netherlands who was to provide invasion troops for the Armada. Coordination with Parma's forces was central to the invasion plan Guzmán was ordered to carry out.
Channel Fleet: The English naval force assigned to defend the Channel during the Spanish Armada campaign. Its resistance obstructed the Armada's passage and its planned meeting with Parma.
Treaty of London (1604): The agreement that ended the Anglo-Spanish War and restored peace between England and Spain. It marks the eventual diplomatic end of the conflict in which Guzmán's expedition was a turning point.
English Armada: The English expedition against Spanish ports and shipping in 1589, led by Francis Drake and John Norreys. Its failure a year later complicates a simple account of Spanish defeat and English naval superiority.
Francis Walsingham: Elizabeth I's principal secretary and spymaster, who helped organize England's intelligence and defenses against Spain. His intelligence network informed English preparations for the expedition Guzmán led.