Traditionally, Vasily is claimed to have been succeeded by his brother Konstantin Vsevolodovich, who died in 1257, but there is no confirmed information about this.
In 1288, Theodore departed Yaroslavl to have his claims to rule formally confirmed by Khan Mengu-Timur, with his mother-in-law as regent during his absence.
During his absence, Xenia secured the support of the boyars and revolted, placing her grandson Michael on the throne with her and her daughter as co-regents during his minority.
[1] When Theodor returned to Yaroslavl, he was met with closed gates and refused entry.
Theodore was not able to secure his rule of Yaroslavl until after the death of Xenia, Maria and Michael.