Rudolf II (18 July 1552 – 20 January 1612) was Holy Roman Emperor (1576–1612), King of Hungary and Croatia (as Rudolf I, 1572–1608), King of Bohemia (1575–1608/1611) and Archduke of Austria (1576–1608). He was a member of the House of Habsburg. Rudolf was born in Vienna on 18 July 1552. He was the eldest son and successor of Maximilian II, Holy Roman Emperor, King of Bohemia, and King of Hungary and Croatia; his mother was Maria of Spain, a daughter of Charles V and Isabella of Portugal. He was the elder brother of Matthias who was to succeed him as king of Bohemia and Holy Roman Emperor. Rudolf spent eight formative years, from age 11 to 19 (1563–1571), in Spain, at the court of his maternal uncle Phillip II. After his return to Vienna, his father was concerned about Rudolf's aloof and stiff manner, typical of the more conservative Spanish court, rather than the more relaxed and open Austrian court; but his Spanish mother saw in him courtliness and refinement. Rudolf would remain for the rest of his life reserved, secretive, and largely a homebody who did not like to travel or even partake in the daily affairs of state. He was more intrigued by occult learning such as astrology and alchemy. He suffered from periodic bouts of "melancholy" (depression), which was common in the Habsburg line. These became worse with age, and were manifested by a withdrawal from the world and its affairs into his private interests.

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