Reign and Rule
Mstislav governed Novgorod from 1088 to 1093, then briefly held Rostov (1093–1095) before returning to Novgorod, where he ruled until 1117. In 1117 his father, Grand Prince Vladimir Monomakh, gave him Kievan Belgorod as his udel (land-holding), effectively making him co-ruler.
On his father's death in 1125 Mstislav inherited the Kievan throne, reigning as Grand Prince for seven years until 1132. During his rule he distributed principalities to his sons, giving Smolensk to his son Rostislav in 1125 — a grant that marked the beginning of Smolensk's political separation.
Church Building
Mstislav's piety expressed itself in extensive church-building throughout his domains. In Novgorod he commissioned St. Nicholas Cathedral in 1113 and the Cathedral of St. Anthony Cloister in 1117, both of which still stand.
As Grand Prince he completed important religious structures in Kiev, including the family sepulchre at Berestovo and the Church of the Assumption of the Mother of God in Podol. He built the Dormition cathedral at Smolensk in 1101 and founded the Theodorov (Theodore) Monastery at Kiev, which later gave spiritual guidance to his descendants.
Military Campaigns
Mstislav led war on many fronts in defense of the Rus' land: against the Cumans (1093, 1107, 1111, 1129), the Estonians (1111, 1113, 1116, 1130), the Lithuanians (1131), and the Principality of Polotsk (1127, 1129).
In 1096 he won a significant victory over his uncle Oleg of Chernigov along the Koloksha River.
Legacy
Mstislav's veneration reflects both his political significance and his piety. Chroniclers marked his death as a turning point, writing that with him gone 'the land of Rus was torn apart,' as the unified Kievan state began to fragment among its princes.
His son Vsevolod (in baptism Gabriel) became Prince of Novgorod and Pskov and is venerated as a saint; on Mstislav's death in 1132 his brother, Prince Yaropolk of Kiev, fulfilled Mstislav's last wishes concerning Vsevolod. Another son, Rostislav (in baptism Michael), Great Prince of Kiev, is likewise venerated as a saint.
