Max Mayeu has worked under a variety of pseudonyms, such as Marco and Badour, but he is best known as Sirius. Born in Soignies, Hainaut, Mayeu grew up in several locations in Spain and South-France, because his father was an engineer who had to travel a lot because of his profession. While studying law in Brussels, he was a journalist for student magazines like L'Avant-Garde and Le Nouveau Journal. He first used his pseudonym Sirius in the pages of Le Patriote Illustré, a paper for a bourgeois audience published by La Libre Belgique.
Sirius joined the Marcinelle-based publisher Dupuis and it's magazine Spirou in 1942. He remained with this magazine for the rest of his career. He took on a more realistic style and created the action series 'L'Épervier Bleu', a sort of Jack London in comics format. Due to censorship, this series was discontinued in 1953, and didn't return until 20 years later.
When 'L'Épervier Bleu' was discontinued in 1953, Sirius began his long-running 'Les Timour' series, based on an idea of Xavier Snoeck. Every episode of this saga explores another period in history with always another member of the Timour dynasty.