In subsequent ages, siege engineers continued to use the name heliopolis for moving towers which carried battering rams, as well as machines for throwing spears and heavy stones.[citation needed] The Byzantines much later used the term helepolis to describe a very different siege engine; the traction trebuchet. The first recorded use of this usage, was by Theophylact Simocatta in describing the siege of Tiflis in the Byzantine–Sassanid War of 602–628.[2]