History of the Common Law of England by Matthew Hale 1713

The Laws of England may aptly enough be divided into two Kinds, viz. Lex Scripta, the written Law: and Lex non Scripta, the unwritten Law: For although (as shall be shewn hereafter) all the Laws of this Kingdom have some Monuments or Memorials thereof in Writing, yet all of them have not their Original in Writing; for some of those Laws have obtain'd their Force by immemorial Usage or Custom, and such Laws are properly call'd Leges non Scriptae, or unwritten Laws or Customs.