Social roles are crucial part to function as society. According to Functionalism, societies function like our biological system, specific organs have specific function, one organ cannot replace other. That's how roles function in a community and this began with earlier farmers, because was the beginning of Sedentary costumes that allowed to build larger communities into cities.
The fall of Ancient Rome started from about AD 190. The Roman Empire was attacked by tribes such as the Goths and the Vandals. Civil wars in parts of the empire further weakened the rule of Rome and respect for Roman law dwindled as a result.