The earliest records of parliament, up to the sixteenth century, are known as the Rolls of Parliament. University of Georgia Libraries has the following:
Great Britain. Parliament. Rotuli Parliamentorum; ut et Petitiones, et Placita in Parliamento. Making of the Modern World (GALILEO); MAGIL, closed stacks (J301 .H12); also Basement (Film HC10 .G655 no.10277.6).
This set covers the reigns of Edward I through Henry VII (1278-1503) and includes an index.