Just to be confusing, the HYW lasted more then a hundred years. So there.
The Hundred Years War was a series of conflicts from 1337 to 1453, waged between the House of Plantagenet, rulers of England and the French House of Valois, over the right to rule the Kingdom of France. Each side drew many allies into the war. [wikiwackypedia]
116, to be exact, which they weren't. During which there were two peaces, one of nine years, the other of 26. Think of it, a hundred-year war, a third of which consisted of peace, prosperity...and the Black Plague...
High on my list of Times It Sucked To Be Alive And Not For Very Long.