In the Edo period, the bakufu started to enforce Tenpo, and in the early of the period, the basic policy of Tenpo was to transfer the Tozama daimyo (nonhereditary feudal lord) to regional areas and to transfer the daimyo on the Tokugawa clan's side (called the Shinpan [Tokugawa's relatives] and the Fudai [hereditary vassals]) to the former territories of the Tozama daimyo.
江戸時代に入り、幕府による転封が行われるが、その初期は外様大名の地方転出、その跡への徳川系大名(親藩・譜代)の進出を基軸として行われた。