Easy defeat of foreign invaders is obviously positive, so it couldn’t be a factor that would topple an empire. Security is good.
Answer:
Feudalism started in the 5th century
Explanation:
Its crackling roots blazed and hissed as a blacksmith plunges a glowing ax or adze in an ice-cold bath and the metal screeches steam and its temper hardens that's the iron's strength - so the eye of Cyclops sizzled round that stake
