Metaxas was the first government leader in the political history of Greece who was named "prime minister". During his premiership, Metaxas managed to maintain order and conduct elections in order to form the First National Assembly. He was elected Honorary Vice-President in five regions and participated in its actions. In next year's elections for the First Period (1844–1845), he was elected Attica MP. He was appointed Minister of Finance in Kolettis' government, a position he held from August 1844 until August 1845, when he resigned after Kolettis' effort to overthrow the constitution. He served as a senator during the years 1846 and 1847 and from 1850 until 1859 as an Attica MP. In 1850, he was promoted to the rank of Lieutenant General and was decorated by King Otto with the Grand Cross of the Order of the Redeemer. On 15 September of the same year, he was sent to Istanbul as ambassador of Greece. He resigned on 10 March 1854, after the start of the Crimean War, and returned to Athens where he retired from politics. It appears that he secretly supported the revolt movement of Thessaly and Epirus and changed the King's hasty decision to get involved, when he secretly rushed to the palace and convinced him not to go there, thus preventing any suffering for Greece. Shortly before his death, Otto assigned him to form a government but he refused. Andreas Metaxas also served as president of the Society for the Promotion of Education and Learning and many charity foundations. Throughout his life he was brave, honest, patriotic and had a strong character. He died in Athens in September 1860.