The invention of writs was really the making of the English Common Law; and the credit of this momentous achievement, which took place chiefly between 1150 and 1250, must be shared between the officials of the royal Chancery, who framed new forms, and the royal judges, who either allowed them or quashed them.

Chapter IV, Improved Legal Procedure, p. 45 - A Short History Of The English Law (First Edition) (1912)