sentences:  In the 1930s, the Swedish Nazis held celebrations on the date of Charles XII's death, and shortly before the outbreak of World War II, Adolf Hitler received from Sweden a sculpture of the king at his birthday.In the late 20th century, Swedish nationalists and neo-Nazis had again used 30 November as a date for their ceremonies, however these were regularly interrupted by larger counter-demonstrations and were abandoned.Apart from being a monarch, the King's interests included mathematics, and anything that would be beneficial to his warlike purposes.