The other classes of which ...

The other classes of which society was composed were, first, freemen, owners of small portions of land, independent, though they sometimes voluntarily became the vassals of their more opulent neighbors, whose power was necessary for their protection.
 Thomas Bulfinch

Quotes from the same author

Religion united its influence with those of loyalty and love, and the order of knighthood, endowed with all the sanctity and religious awe that attended the priesthood, became an object of ambition to the greatest sovereigns.
 Thomas Bulfinch