After 1648, the political situation in the Polish–Lithuanian Commonwealth underwent years of crisis. The Khmelnytsky Uprising was a Cossack rebellion in Ukraine which posed a threat to the existence of the Commonwealth. One of the targets of the Cossacks was the liquidation of the Greek-Catholic Church, and this request was considered acceptable by the Latin CatholicPoles who, after being defeated by the Cossacks, signed the Treaty of Zboriv in 1649, only the Papal nuncio and Greek-Catholic bishops being opposed. The Cossacks army arrived to forcedly abolish the Greek-Catholic eparchy of Chełm, one of the strongholds of the Greek-Catholic Church. In September 1651, due to a temporary defeat of the Cossacks, the new Treaty of Bila Tserkva was signed and it contained no more statements about the liquidation of the Greek-Catholic Church, which was allowed to reenter Chełm and Przemyśl. In 1652, Havryil Kolenda was consecrated a bishop with the title of bishop of Mstsislaw by his Metropolitan Antin Sielava. On 23 June 1563 the coadjutor bishop of the Metropolitan, Pachomius Oranski bishop of Pinsk, was killed by the Cossaks, and Kolenda was chosen as new coadjutor with the right of succession. After a couple of years of truce, in 1654 the Cossacks allied with the Russian tsar in the Treaty of Pereyaslav which led to the Russo-Polish War, besides the Second Northern War with the invasion from Sweden. These wars led to a period of mass murders and poverty known as the Deluge. The Russian army from North, and the Cossacks from South, occupied the territories of the Greek-Catholic Church, and destroyed churches, monasteries, and schools, and killing priests and monks. On 5 October 1655 the Metropolitan of Kiev, Antin Sielava, died. Kolenda succeeded him as Administrator of the Greek-Catholic Church but not as Metropolitan, because due to the war it was not possible to convene the electoral synod as requested by Rome or to obtain the appointment from the King, who preferred not to displease the powerful Cossacks. In the meantime the wars went on. Kolenda had to flee Polotsk, bringing with him the relics of Saint Josaphat, and he moved to Supraśl Lavra. The Treaty of Hadiach of 1658 signed between Poland and the Cossacks foresaw again the liquidation of the Greek-Catholic Church. This treaty was however not fully enforced because of successive divisions among the Cossacks.
Metropolitan
The problems for Kolenda's Church in this period came also from the Latin Catholic bishops of Poland, who tried to persuade Rome to terminate the Greek-Catholic Church and to extend their jurisdiction over the Byzantine Rite faithful. To obtain some help for his Church, Kolenda sent in 1644 to Rome the bishop of Chełm, Jacob Souza, who succeeded in convincing the papacy to take a stand for the Ukrainian Greek Catholic Church, reaffirming its independence from the Latin episcopate, obtaining the appointment of Kolenda as Metropolitan, confirming the validity of ordinations made by Orthodox, and ruling about the Basilian Order. Thus on 22 April 1665 Havryil Kolenda was formally appointed as Metropolitan of Kiev. After the Truce of Andrusovo in 1667 the war ended and the situation of the Ukrainian Greek Catholic Church improved, even if it had to leave the town of Smolensk and the capital Kiev. In 1668, and later in 1669, Kolenda succeeded in obtaining from the King of Poland the decrees for the restitution of the churches and properties seized during the wars. In 1667 Kolenda became the Proto-Archimandrite of the Basilian Order, ending ten years of disputes about the heading of the order. Havryil Kolenda died on 11 February 1674 and was buried on 18 February in the Saint Sophia Cathedral in Polotsk.
