William Jordan Flake was a prominent member of the Church of Jesus Christ of Latter-day Saints, who helped settle parts of Arizona, and was imprisoned at the Yuma Territorial Prison for polygamy.

The Yuma Territorial Prison is a former prison located in Yuma, Arizona, United States. Opened on July 1, 1876, and shut down on September 15, 1909. It is one of the Yuma Crossing and Associated Sites on the National Register of Historic Places in the Yuma Crossing National Heritage Area. The site is now operated as a historical museum by Arizona State Parks as Yuma Territorial Prison State Historic Park.