1024. In the decisive battle, which was fought at Listven near Chernihiv, Mstislav emerged the victor. Yaroslav the Wise surrendered all the territories to the east of the Dnieper River to Mstislav. After this distribution of the lands of Kievan Rus' Mstislav ruled in his principality autonomously. He ordered the erection of a stone and masonry cathedral, dedicated to the Transfiguration of the Holy Savior, in his capital in 1030 or 1031. Mstislav forced the Alans who dwelled along the lower course of the river Don to accept his suzerainty in 1029. He closely cooperated with his brother in the last years of his life. Yaroslav and Mstislav jointly invaded Poland and occupied the Cherven towns in 1031. The Primary Chronicle narrates that they "also captured many Poles and distributed them as colonists in various districts." Mstislav's only known son, Evstafy died in 1033. According to the Primary Chronicle, Mstislav "fell sick and died" on a hunting expedition between 1034 and 1036. He was buried in the Transfiguration of the Holy Savior Cathedral which had been by that time "built to a point higher than a man on horseback could reach with his hand". For Mstislav died having no sons, his principality was united with his brother's realm. References Sources Primary sources John Skylitzes: A Synopsis of Byzantine History, 811–1057 (Translated by John Wortley with Introductions by Jean-Claude Cheynet and Bernard Flusin and Notes by Jean-Claude Cheynet) (2010). Cambridge University Press. . The Russian Primary Chronicle: Laurentian Text (Translated and edited by Samuel Hazzard Cross and Olgerd P. Sherbowitz-Wetzor) (1953). Medieval Academy of America. . Secondary sources 970s births 1036 deaths Eastern Orthodox monarchs Princes of Chernigov Princes of Tmutarakan Children of Vladimir the Great Russian duellists