Armstrong Siddeley was a British manufacturer known for producing aircraft engines and luxury cars. Founded in 1919, the company initially focused on aviation, creating engines for military and civilian aircraft during both World Wars. Their products were recognized for quality and innovation, contributing significantly to the aerospace industry. In the post-war era, Armstrong Siddeley shifted its focus to automobiles, producing high-end cars that were popular in the mid-20th century. The company became known for its elegant designs and powerful engines, appealing to affluent customers. Eventually, it merged with other firms, leading to its decline in the automotive market.