This document summarizes the history of Triumph motorcycles from 1902 to the present day in brief sections organized by time periods. It notes that Triumph began producing motorcycles in 1902 and focused on military production during World Wars I and II, producing over 50,000 motorcycles for the war efforts. Major models introduced include the Bonneville in the 1950s and Thunderbird in the late 1940s, which helped popularize Triumph motorcycles. The company struggled financially in the late 1960s and went out of business in 1983 before being resurrected by new ownership in the 1990s, returning Triumph motorcycles to production.