By the mid-18th century AD the Islamic state had expanded dramatically, and it remained firm for three successive centuries and only the Mediterranean islands of Sicily and Crete were later added. Thus there was an Islamic empire almost similar in terms of size and population to the Roman Empire. Only the Tang dynasty in China matched these two empires. Those conquests, which established an Islamic civilization whose signs remained even after the old borders disappeared and new plans and challenges emerged, make us pose questions about their secrets, the record speed in which they were made, their enormous expansion and the ingredients for their long survival