 The Constitution of 1864 was drafted following the models of the Constitutions of Belgium of 1831 and of Denmark of 1849, and established in clear terms the principle of popular sovereignty, since the only legislative body with reversionary powers was now the Parliament.Furthermore, article 31 reiterated that all the powers stemmed from the Nation and were to be exercised as provided by the Constitution, while article 44 established the principle of accountability, taking into consideration that the King only possessed the powers that were bestowed on him by the Constitution and by the laws applying the same.The Assembly chose the system of a single chamber Parliament (Vouli) with a four-year term, and hence abolished the Senate, which many accused of being a tool in the hands of the monarchy.