Constitution of San Marino
The constitution of the Republic of San Marino is distributed over a number of legislative instruments, the most important of which are the Statutes of 1600 and the Declaration of Citizen Rights of 1974, as amended in 2002.
The constitutional system shows influences of Roman customary law and Justinian I's Corpus Juris Civilis (529–534).
It is the world's oldest surviving constitution of any sovereign state, barring England's Magna Carta (1215).