Tithable Products of the Land - From the Leges Edwardis Confessoris but written after 1115. - http://www.fordham.edu/halsall/source/1115Ledwtith.html
Provision for Peter's Pence - William the Conqueror's provision for Peter's Pence. From the Medieval Sourcebook. - http://www.fordham.edu/halsall/source/1087william1-peterspence.html
The Saladin Tithe, 1188 - A crucial early taxation proclamation that laid the foundation for non-land based taxation. From the Internet Medieval Sourcebook. - http://www.fordham.edu/halsall/source/1188Saldtith.html