Several factors led to the growth of feudalism. They differed from region to region and period to period. They are summarized as under.

1. During the rule of weak Kings the Provincial Officers obtained independent authority. The political rule became more decentralized to suit feudal rule. 

2. To protect themselves from the ‘Barbarian – invaders’ of Germanic tribes, the smaller land holders gave up their claims over their lands and surrendered them to the local Lords. This gave a sense of security of life and property and helped in the development of feudalism. 

3. The weakening of Kings’ control over the Vassals also lessened their control over the people. People were more loyally bound to the Lords, which strengthened feudalism.

4. The Kings were very much dependent on the Vassals to defend their Kingdom, whereas the vassals required the King’s legal sanction over their land. This mutual dependence strengthened feudalism.

5. It was impossible for Kings to control vast lands, as there were no adequate roads and means of transport. Moreover the financial burden of ruling over a vast Empire made it impossible fora united rule. 

6. The absence of a strong political system, insecurity of life and property made the presence of feudal Lords inevitable. These feudal lords took the responsibility of protecting the property of the people from thieves, bandits, invaders etc,. 

7. It was an agrarian society based on land. The King was the absolute land owner and he could only give lands as grants or ‘fiefs’ to the Lords in exchange of their services. The same system was followed down the line. Feudalism was also inevitable due to the absence of industries and the serfs were bound to the land.