The abolition of slavery occurred at different times in different countries.

(German: Der Weg zur Knechtschaft) a book by the Austrian-British economist and philosopher Friedrich Hayek.

In tsarist Russia, the term serf meant an unfree peasant who, unlike a slave, historically could be sold only together with the land to which they were "attached".

There is a prolonged public disagreement over the extent and nature of serfdom in Tibet prior to the annexation of Tibet into the People's Republic of China in 1951.

Serfdom has a long history that dates to ancient times.