The first Cadillac automobiles were the 1903 Model built in the last quarter of 1902. These were 2-seater "horseless carriages" powered by a reliable and sturdy 10 hp (7 kW) single-cylinder engine developed by Henry Martyn Leland and built by of Detroit, of which Henry Leland was founder, vice-president and general manager. The one cylinder Cadillac continued to be offered through 1908 in the runabout, tonneau or delivery bodies under a variety of Model designations which are delineated below.