Despot himself in that period, even though he was a vassal of the Ottoman sultans, is not giving up on efforts to rid the Ottoman domination, as evidenced by the letters he wrote to his subordinates in Hungary and the Byzantine and deputies in the Republic of Venice, that in the case of the creation of a wider anti-Ottoman coalition it joined Serbia. The period of peace, Stefan used to finish his monumental endowment Resava, with today's Despotovac. Its construction began in 1407 but was repeatedly interrupted by outbursts of the Ottoman Empire (1409, 1411-1413), that were finished in 1418.