the fall of the roman empire (invasion by barbarian tribes) (29 dez 300 ano – 4 set 475 ano)
Descrição:
 Barbarians are tribes that tried to invade rome but rome defeated it so it lost some power and soliders and this was an external reason. 
Adicionado na linha do tempo:
Data:
29 dez 300 ano
4 set 475 ano
 ~ 174 years