This study handles the tribe of Germanic Heruls in the Medieval that relotes to the eastern German peoples .The Heruls tribe played an important role in the history of the medieval Europe because of the characteristics of their sons and their fierce fighting this appears clearly in the wars of the emperor Justinian against his enemie so there came the leaders amongst then. I'v divided this study into many points ;the tribe identity, its geographical distribution and went on to talk about its political and military role through their partticipations in wars with their neighbours or under the rule of Justinian.After that I moved on to the social life of the tribe ;what their customs and bout the regime ,and administration and army. Finally ,The conclusion about the most important results of the study.