This is why the Prophet PBUH sent a letter to world leaders of the time to invite them to Islam such as the letter to Chosroes, the Emperor of Persia, the envoy to Caesar and so on.
Nabigu wuxuu Waraaqo dhambaal u kala diray guud ahaan dawladihii Dunida ka jiray xilligaa si uu iclaamiyo inuu yahay Rasuul loo soo diray dhamaan Basharka, Sidaa darteed waraaq ayuu u diray Boqorkii Faarisiyiinta ee Kisra laguna naanayso Shaahan Shaah amase Boqorka Boqorada ..