 Complete the following phrase:  Princes Mircea I and Vlad III of Wallachia, and Stephen III of Moldavia defended their countries independence against the Ottomans. Most Wallachian and Moldavian princes paid a regular tribute to the Ottoman sultans from 1417 and 1456, respectively. A military commander of Romanian origin, John Hunyadi, organised the defence of the Kingdom of Hungary until his death in 1456. Increasing taxes outraged the Transylvanian peasants, and 