A holding of 30-15 acres of arable land, a yardland or half yardland, was generally reckoned enough to support a peasant farmer and his family. A groom in household service would live about as well., perhaps receiving somewhat finer clothes than the husbandman in livery as a matter of display.
Also: Poorest landed lesser merchants or artificers. Pleaders. Monks and canons from lesser houses.