Fundamental Law of Vatican City State

The Fundamental Law of Vatican City State is the primary constitutional document governing the civil administration of the Vatican, the sovereign city-state established under the 1929 Lateran Treaty. First enacted by Pope Pius XI on June 7, 1929, it set out how legislative, executive and judicial power would be organized within the small state surrounding St Peter's Basilica, distinct from the Holy See's own governance of the wider Catholic Church. The law has been replaced in full more than once as later popes reshaped Vatican governance: Pope John Paul II promulgated a wholly new version in 2000, which took effect in February 2001 and abrogated the earlier 1929 text along with any conflicting norms, and Pope Francis issued a further revision in 2023. Each version has kept the same basic pattern of vesting supreme legislative authority in the pope while delegating day-to-day administration to a commission of cardinals, reflecting the fact that Vatican City exists as a state precisely to guarantee the independence of the papacy.