The elder brother of the holy noble prince Alexander Nevsky, Theodore was born in 1218. The princely ministry of his native land began very early - already in 1228.
Both brothers were left in Novgorod by their father, Prince Yaroslav Vsevolodovich, as representatives of his government. Less than a year later, the young princes had to leave the city; violent Novgorodians decided at the veche to call another prince. In 1230, Prince Theodore, on behalf of his father, again began to reign in Novgorod.
In 1232, the 14-year-old Theodore was already called to serve God not only with prayer, but also with a sword: he participates in the campaign of Russian squads against the pagan Mordovian princes. In 1233, at the request of his father, he was to marry, but when the guests had already gathered for the wedding feast, the groom suddenly died. This happened on June 5 (according to the old style), 1233.
Saint Prince Theodore was buried in the Yuryev Monastery in the city of Novgorod. In 1614, the Swedes, having destroyed the monastery, smashed the tomb of the prince and, having found his incorruptible relics, outraged them, placing the body, "as if alive," near the church wall.
Now the relics of the Holy Prince Theodore rest in the Novgorod Sophia Cathedral.