Ivan's greatest success, however, was convincing the Khan in Sarai that his son, Simeon The Proud, should succeed him as the Grand Duke of Vladimir; from then on, the important position almost always belonged to the ruling house of Moscow.
Ivans største succes var dog at overbevise khanen i Sarai om, at hans søn skulle efterfølge ham som storfyrste af Vladimir; fra da af tilhørte denne vigtige position næsten altid det regerende hus i Moskva.