The article examines the evolution of the Hungarian Public and Constitutional Law from 1301 until the Austro-Hungarian compromise in 1867. The topic is highly relevant, because the year 2017 marked the 330th anniversary of the 1st and 2nd Act of 1687, which state that the Habsburgs are the only and true heirs of the Hungarian throne; it also marked the 150th anniversary of the Austro-Hungarian Compromise. Furthermore the current Fundamental Law says that “We honour the achievements of our historical constitution and we honour the Holy Crown, which embodies the constitutional continuity of Hungary’s statehood and the unity of the nation”. The main chain of thoughts of the article presents the crown-ideology and the Doctrine of the Holy Crown, the Rákos field resolution of 1505, the Acts 2 and 3 of 1687, the Pragmatic Sanction, Acts 10 and 12 of 1790, the public law aspects of the April Laws of 1848, and the laws on the Austro-Hungarian Compromise. The article presents the fundamental documents of the Hungarian uncodified historical Constitution issued within the given period. Through their formation and historical background we can truly understand the Hungarian customary law and the legal traditions, which are still honoured by our present Fundamental Law.