After the golden age in Kiev, the nation began to see a rapid decline. Yaroslav was a successful leader who brought about great wealth and power to his homeland, but he is also one of the major factors in its decline.
Instead of appointing one successor, Yaroslav appointed all of his sons as successors. This resulted in the splintering of his kingdom, as many different princes fought for control over the kingdom.
In 1240 A.D., invaders from Mongolia conquered and completely destroyed Kiev.