For 10 points, name this foremost city of the Rus, the capital of Ukraine.
Most of its population was killed in 1238 by Bat Khan. By the terms of 1667's Treaty of Andrusovo, this city became part of an autonomous Cossack state. Simon Peltyura declared an independent nation here in 1918, and The Tale of Bygone Years claims that this city was founded by the brothers Shchek, Kiy, and Khoriv. Oleg of Novgorod made it capital of the first East Slavic state in 882 CE, and the nearby (*) ravine of Babi Yar was the site of a massacre by Nazis during World War II. For 10 points, name this foremost city of the Rus, the capital of Ukraine.
Most of its population was killed in 1238 by Bat Khan. By the terms of 1667's Treaty of Andrusovo, this city became part of an autonomous Cossack state.
Kiev