The sovereignty of Clipperton Island was settled by arbitration between France and Mexico. King Victor Emmanuel III of Italy rendered a decision in 1931 that the sovereignty of Clipperton Island belongs to France from the date of November 17, 1858.' The Mexican claim was rejected for lack of proof of prior Spanish discovery and, in any event, no effective occupation by Mexico before 1858, when the island was therefore "territorium nullius", and the French occupation then was sufficient and legally continuing."