Career
He succeeded Iuga to the throne, and, as a ruler, initiated a series of reforms while consolidating the status of the Moldavian Principality. Alexander expanded the bureaucratical system by creating the "Council of the Voivode", the Chancellory and by adding (in 1403) the institution of Logofăt – Chancellor of the official Chancellery. During his reign, he introduced new fiscal laws, by adding commercial privileges to the traders of Lviv (1408) and Krakow (1409), improved the situation of the trading routes (especially the one linking the port of Cetatea Albă to Poland), strengthened the forts guarding them, and expanded the Moldavian ports of Cetatea Albă and Chilia.
He also had a role in ending the conflict of the Moldavian Eastern Orthodox with the Patriarch of Constantinople.
He built Bistrița Monastery where he is buried and continued the building of Neamț Monastery which was started in the previous century. In order to do that, he forged a system of alliances with Wallachia and Poland, generally against Hungary (although he had been backed to the throne by Sigismund of Hungary).
In 1402, he was sworn vassal of Jogaila, the King of Poland. The treaty was renewed in 1404, 1407, 1411 and 1415.
He also got involved in the power struggles of Wallachia, by helping Radu II Prasnaglava in 1418–1419 and Alexandru I Aldea in 1429, mostly in order to prevent the capture of Chilia.
Due to a territorial claim of Poland and the previous failure of the Polish king to fulfill his part of the vassality treaty during an Ottoman attack in 1420, Alexander launched an attack on Poland during the Lithuanian Civil War (1431–1435). The attack ended with the treaty of Suceava on November 18, 1431. Alexander makes the first documentary confirmation of the gypsy slavery in Moldova, giving the monastery of Bistrița 31 gypsy families along with some cattle.
He died on January 1, 1432, and was buried in the Bistriţa Monastery.