Tortuga was a planet located in a region of space known as the swirl-rift. Although settled by the Kzin, it was only nominally under the control of the Patriarchy. Tortuga was a poor world and neither the Kzin nor the humans had much interest in it, even after hyperdrive ships came into use. Mostly it was a place for pirates to lay low, and for unwanted or dishonored Kzintosh to escape to. By 2435 C.E. the entire planet had less than one million permanent residents.