The oldest son of Yaroslav, was one of the authors of the Pravda Yaroslavichey which is part of the first legal code of Rus’ commonly called the Russian Truth (Russkaya Pravda). As a result of a popular uprising in 1068 Iziaslav was deposed and fled to Poland. In 1069 he retook Kiev with the help of the Polish army; however, he was ousted again by his brothers in 1073. Iziaslav turned to the German emperor, the king of Poland and the pope for help on several occasions. He succeeded in retaking Kiev once again in 1076, but soon died in an internecine war against Princes Oleg and Boris, his brother, in the battle of Chernigov.