Historia Amoris by Edgar Saltus

In the making of the world that was Rome, ages combined. Centuries unrolled in its dissolution. Step by step it had ascended the path of empire, step by step it went down. The descent completed, Rome herself survived. The eternal feminine is not more everlasting than the Eternal City. Yet, in the descent, her power, wrested from a people who had but the infirmities of corruption, by others that had only the instincts of brutes, left but vices and ruins. From these feudalism and serfdom erupted. Humanity became divided into beasts of burden and beasts of prey.

Feudalism was the transmission of authority from an overlord to an underlord, from the latter to a retainer, and thence down to the lowest rung of the social ladder, beneath which was the serf, between whom and his master the one judge was God.