Roi-des-Belges ("King of Belgium") or tulip phaeton was a car body style used on luxury motor vehicles in the early 1900s. It was a double phaeton with exaggerated bulges suggestive of a tulip. The rear bulges accommodated two corner seats like tub armchairs which were accessed from the rear by a central door with a small fold-down seat. The Roi-des-Belges style began with a 1901 40 hp Panhard et Levassor with a Rothschild body commissioned by Leopold II of Belgium, Roi des Belges. The style was suggested by Leopold's mistress, Cléo de Mérode.