In August 1941, Hillborough was founded in Toronto, Ontario, Canada by Adrian Dingle, the brothers René and André Kulbach, and an anonymous investor. Their flagship title was called Triumph-Adventure Comics, and featured the most famous character of what has been called the Golden Age of Canadian comics—Dingle's Nelvana of the Northern Lights, the first Canadian female superhero, who debuted several months before Wonder Woman.^[1]

After seven monthly issues, Dingle brought Triumph-Adventure to Bell Features in early 1942,^[2] and was followed by most of the Hillborough staff.^[1]

• Bell, John (2006). Invaders from the North: How Canada Conquered the Comic Book Universe. Toronto: Dundurn Press. ISBN 978-1-55002-659-7.