Cossack Rada (Ukrainian: Козацька рада, Kozats'ka Rada) was a general cossack meeting often military in nature. It was also known as the Chorna Rada, from the Slavic chern - mob.
The Rada was an institution of cossack administration in Ukraine from 16th to 18 centuries. One of the famous such councils was the Chorna rada of 1663 described in the novel of Panteleimon Kulish. At that council the Hetmanate faction of Khmelnytsky were deposed from the government and replaced by Bryukhovetsky, the first hetman who became the Russian boyar.[1]