Vytautas' greatest successes and recognition occurred at the end of his life, when the Crimean Khanate and the Volga Tatars came under his influence. Prince Vasily I of Moscow died in 1425, and Vytautas then administered the Grand Duchy of Moscow together with his daughter, Vasily's widow Sophia of Lithuania. In 1426–1428 Vytautas triumphantly toured the eastern reaches of his empire and collected huge tributes from the local princes. Pskov and Veliki Novgorod were incorporated to the grand duchy in 1426 and 1428. At the Congress of Lutsk in 1429, Vytautas negotiated the issue of his crowning as the King of Lithuania with Holy Roman Emperor Sigismund and Jogaila. That ambition was close to being fulfilled, but in the end was thwarted by last-minute intrigues and Vytautas' death. Vytautas' cult and legend originated during his later years and have continued until today.