Yaroslav OF KIEV the Wise

  General Notes:

He was Grand Prince of Novgorod and Kiev, uniting the two principalities for a time under his rule.
He was vice-regent of Novgorod at the time of his father's death in 1015.
Subsequently, his eldest surviving brother, Svyatopolk the Accursed, killed three of his other brothers and seized power in Kiev. Yaroslav, with the active support of the Novgorodians and the help of Varangian mercenaries, defeated Svyatopolk and became the grand prince of Kiev in 1019.
Under Yaroslav the codification of legal customs and princely enactments was begun, and this work served as the basis for a law code called the Russkaya Pravda ("Russian Justice").
During his lengthy reign, Rus' reached the zenith of its cultural flowering and military power.

Yaroslav married Ingegerd Olofsdotter of Sweden, daughter of King Olof Skötkonung of Sweden and Estrid of the Obotrites. (Ingegerd Olofsdotter of Sweden was born in 1001 and died on 10 Feb 1050.)