The Sobornoye Ulozhenie (, "Code of Law") of 1649 gave serfs to estates, and in 1658, flight was made a criminal offense. Russian landowners eventually gained almost unlimited ownership over Russian serfs. The landowner could transfer the serf without land to another landowner while keeping the serf's personal property and family; however, the landowner had no right to kill the serf. About four-fifths of Russian peasants were serfs according to the censuses of 1678 and 1719; free ("black") peasants remained only in the north and north-east of the country.