While most Christian writers who described the fall of Constantinople to the Ottoman Turks in 1453 regarded the disaster as divine retribution for the sins of its inhabitants, carried out through the agency of the barbaric and infidel Turks, the historical work of Laonikos Chalkokondyles takes a very different approach to the problem. It argues that nations rose or fell partly through luck, but also according the virtue they possessed, so that the Turks, rather than being mere agents, could in fact take the credit for their success. In this approach, Chalkokondyles reflects not classical Greek literature, but a western tradition to be found in Livy and Cicero, a strand of thought that he may have adopted as a result of contacts with Renaissance Italy.