Iziaslav I of Kiev

Iziaslav I Yaroslavich (1024–1078) was the eldest son of Yaroslav the Wise. His marriage to Gertrude, sister of the Polish king Casimir I, sealed their 1043 agreement. Prince of Turov from 1045, he became Grand Prince of Kiev in 1054, ruling with his brothers Sviatoslav and Vsevolod, and helped compose the law code of Yaroslav's descendants.

In 1067 the brothers defeated and seized Vseslav of Polotsk under a truce. After the Cumans defeated them at the Alta River in 1068, a Kiev uprising drove Iziaslav into Polish exile.

Restored in 1069, he was expelled again in 1073 and regained Kiev only in 1077. On 3 October 1078 he fell fighting Oleg Sviatoslavich, the only ruling Grand Prince killed in battle.