Infante Don Juan was a Spanish royal born in 1629, the son of King Philip IV of Spain and Mariana of Austria. He was a member of the House of Habsburg and held the title of Infante, which is a designation for a prince who is not the heir to the throne. Don Juan was known for his military involvement and was appointed as the governor of Flanders. Despite his noble lineage, Don Juan's life was marked by political intrigue and personal challenges. He was involved in various military campaigns during the Eighty Years' War and sought to enhance Spain's influence in Europe. His legacy is often overshadowed by the complexities of the Spanish monarchy during his time.