Written by Michael Hirst, this series is an epic romantic adventure based on the life of famous 嗄merican outlaw Billy the Kid, also known as William H. Bonney — from his humble Irish roots, to his early days as a cowboy and gunslinger in the 嗄merican frontier, to his pivotal role in the Lincoln County War and beyond.Written by Michael Hirst, this series is an epic romantic adventure based on the life of famous 嗄merican outlaw Billy the Kid, also known as William H. Bonney — from his humble Irish roots, to his early days as a cowboy and gunslinger in the 嗄merican frontier, to his pivotal role in the Lincoln County War and beyond.