The Europeans were also concerned about the long-term goals of the Mongols. Early Mongol diplomacy had been not a simple offer of cooperation, but straightforward demands for submission. It was only in later communications that Mongol diplomats started to adopt a more conciliatory tone; but they still used language that implied more command than entreaty. Even the Armenian historian Hayton of Corycus, the most enthusiastic advocate of Western-Mongol collaboration, freely admitted that the Mongol leadership was not inclined to listen to European advice. His recommendation was that even if working together, European armies and Mongol armies should avoid contact because of Mongol arrogance. European leaders were aware that the Mongols would not have been content to stop at the Holy Land, but were on a clear quest for world domination. If the Mongols had achieved a successful alliance with the West and destroyed the Mamluk Sultanate, they certainly would have eventually turned upon the Franks of Cyprus and the Byzantines. They also would have surely conquered Egypt, from which they could have continued an advance into Africa, where no strong state could have stood in their way until Morocco and the Islamic caliphates in the Maghreb.