Gadriel Demartinos was born in Catalonia, Spain, the youngest son of five children. From an early age, he traveled and relocated to several cities around the world with his family. Demartinos is of Spaniard/Greek descent from his father's side and Portuguese/Gypsy from his mother's.

A lifelong film and art enthusiast, he is known for writing thrillers with detailed fiction and provocative themes. Demartinos began drafting his first novel, "Eternal Darkness, Blood King," about the struggles of a powerful vampire facing impossible odds, while still a student. The draft became a novel in early 2012 when he was sure the story was complete. His crafting of fictional scenarios is noted for its realism.