In 1967, he supported the Georgios Papadopoulos coup d'état and received a number of senior military posts during the dictatorship that followed.

[2][3][4][5] He was given the title of President of the Republic on 25 November 1973, after Papadopoulos was ousted by Dimitrios Ioannidis as head of the regime in an internal power struggle.

[8] After the fall of the dictatorship in 1974, he retained his post for four months pro tempore, until a new constitution could be enacted during metapolitefsi; he was then replaced by Michail Stasinopoulos.

In 1976, a military judicial council dropped proceedings against him and 88 other former officers charged with treason and mutiny for collaborating with the former junta.

[2] He died on 26 July 1999 at the NIMTS military hospital in Athens, just one month after his predecessor, Georgios Papadopoulos.