On 3 September 1843, the military garrison of Athens, with the help of citizens, rebelled and demanded from King Otto the concession of a Constitution.
Its main provisions were the following: It established the principle of monarchical sovereignty, as the monarch was the decisive power of the State; the legislative power was to be exercised by the King - who also had the right to ratify the laws - by the Parliament, and by the Senate.
The members of the Parliament could be no less than 80 and they were elected for a three-year term by universal suffrage.
The ministers' responsibility for the King's actions is established, who also appoints and removes them.
On the night of 10 October 1862 the rising wave of discontent led the people and the military to rebel and to decide Otto's deposition.