Feudalism 

Early English parliament

Parliaments and taxation in England 1200-1500

  • Start here (excellent), the note on the web site the UK Parliament: a quick take on Edward I and parliaments.

Sovereign debt, an introduction:

  •  Kauper Richard W. Bankers to the Crown: The Riccardi of Lucca and Edward I:
  • Bulow, J. and K. Rogoff (1989). "Sovereign debt: Is to Forgive to Forget?" American Economic Review43-50. Read only Sections I and II (no equation). (An influential article in the modern literature on sovereign lending)