I was doing some research on the Triumph motorcycle logo and stumbled across a page where someone had already put the whole history together. In fact, Soren Winslow's site is full of information on Triumphs, like the whole 127 years of Triumph's motorcycle history, significant models, and a whole lot more. If you're interested in Triumph's heritage, you should give it a read.
Here is his history of the Triumph Motorcycle logo direct from his site: