Socage

[…] this quiz with all the strange old terms in it, curtilage and messuage and socage and fee simple and fee tail and feoffee and copyhold and customary freehold and mortmain and devises and lex loci rei sitae.

The rest was held by tenants, sometimes called "sokemen" from the "soke" or jurisdiction; and said to hold in "soccage" because they gave plough-service by way of rent.