"Tokitsugu-kyoki" (Tokitsugu journal) is well known as a primary source indispensable to understanding the situation of territories in the vicinity of the capital and under direct imperial rule in the Sengoku Period (Period of Warring States).
『言継卿記』は、戦国時代の京都を中心とする畿内の情勢を知る上で必要不可欠な一級史料として知られる。