Maciej Rataj
He was Acting President twice: from 16 December to 22 December 1922 and from 15 May to June 4 1926. For the first time he served between assassination of Poland's first President Gabriel Narutowicz and election of his successor Stanisław Wojciechowski. For the second, between Wojciechowski resignation after a May coup and election of Ignacy Mościcki.