General Theodoros Pangalos assumed power in June 1925, and dissolved Parliament in September of the same year.

A few months later, in March 1926, after the resignation of the President of the Republic, Pavlos Kountouriotis, who was protesting the arbitrariness of the Pangalos government, Demertzis was nominated, by almost all the parties at the time, as a common candidate to succeed him.

[2] In 1935 and after the restoration of the Kingdom in Greece, Konstantinos Demertzis, who was not a member of any political party at the time, was invited by King George II to take over as prime minister and finally form the " Achron government ", succeeding Georgios Kondylis.

The day after the elections, Demertzis put his resignation at the disposal of the King, but because all the attempts of negotiations made with the political leaders failed to form a government, according to the then constitution, King George II once again resorted to Demertzis in order to form government and then to be judged by the Parliament with a vote of confidence.

[2] In the end, this process was not completed, because on the morning of April 13, 1936, Konstantinos Demertzis died from a heart attack.