This post only contains rough notes.
Each person was expected to give one-tenth of their earnings to support the church.
There was one beneficial result of Tithes, the great tithe barns of the Church could become a charity food store in times of need.
From 1220 to 1315 there was no famine in England. By 1315 farming would have been quite trade oriented. The great markets of London were only a few hours away.