Headless Horseman

The Headless Horseman was a character in European folklore since at least the Middle Ages. He seems to be a human with a pumpkin in place of his head.

Encounters
In the mid-18th century, Assassin-turned-Templar Shay Cormac could encounter and fight the Horseman at night near the Old Dutch Church of Sleepy Hollow in Sleepy Hollow, New York.

During the American Revolution, the Assassin Ratonhnhaké:ton was told a tale of the Horseman by Daniel Boone. He searched the Frontier, and eventually saw him, laughing as he rode away on horseback.