 His reign was one of the most successful in Moldavia's history.For all of his success, it was under the reign of Alexander I that the very first confrontation with the Ottoman Turks took place at Cetatea Albă in 1420.A deep crisis was to follow Alexandru's long reign, with his successors battling each other in a succession of wars that divided the country until the murder of Bogdan II and the ascension of Peter III Aaron in 1451.