The Polish law, or legal system in Poland. has been developing since the first centuries of Polish history, over 1,000 years ago. The public and private laws of Poland are codified. The supreme law in Poland is the Constitution of Poland. Poland is a civil law legal jurisdiction and has a civil code, the Civil Code of Poland. The Polish parliament creates legislation (law) and is made up of the 'Senate' (upper house) and 'the Sejm' (lower house).