Sword with Terminus EstSF-Lovers

I was just reading Gene Wolfe's Shadow of the Torturer. The sword with the engraving called Terminus Est was mentioned. The name rings a bell; where did I hear this name before? The only famous swords I can think of are Excalibur, and Roland's sword (name starts with a C, I think) Anyone who can help me on this one? Sridhar H. Dasari