 Pessoa also developed a strong interest in astrology, becoming a competent astrologist.He elaborated more than 1,500 astrological charts, including well-known people like William Shakespeare, Lord Byron, Oscar Wilde, Chopin, Robespierre, Napoleon I, Benito Mussolini, Wilhelm II, Leopold II of Belgium, Victor Emmanuel III, Alfonso XIII, or the Kings Sebastian and Charles of Portugal, and Salazar.In 1915, he created the heteronym "Raphael Baldaya", an astrologist who planned to write "System of Astrology" and "Introduction to the Study of Occultism".