Alexander the Good (Romanian: Alexandru cel Bun pronounced [alekˈsandru t͡ʃel bun] or Alexandru I Mușat) was a Voivode (Prince) of Moldavia, reigning between 1400 and 1432, son of Roman I Mușat. 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 Kraków (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.