In order to legitimize their control or gain an advantage over neighboring daimyo, many sengoku daimyo gave substantial donations to the Imperial Court in return for an official title (these titles reserved for samurai were known as buke kani).
一方、支配正統性の確立・近隣への優越という動機に基づいて、朝廷へ多額の貢納を行う見返りに官位（武家官位）を獲得する戦国大名も多数存在した。