While the region of Transnistria was never politically part of the Principality of Moldavia, there were sizable areas which were owned by Moldavian boyars and given by the Moldavian rulers. The earliest surviving deeds referring to lands beyond the Dniester river date from the 16th century. Moldavian chronicle Grigore Ureche which mentions that in 1584, some Moldavian villages from beyond the Dniester in the Kingdom of Poland were attacked and plundered by Cossacks. Many Moldovans were members of Cossacks units as well, with two of them, Ioan Potcoavă and Dănilă Apostol becoming hetmans of Ukraine. Ruxandra Lupu, the daughter of Moldavian voivode Vasile Lupu who married Tymish Khmelnytsky, lived in Rașcov according to Ukrainian tradition.