Sakakibara Yasumasa, one of the Four Heavenly Kings, fought in countless battles for Ieyasu. At the Battle of Komaki-Nagakute in 1584, he launched a surprise attack on Ikeda Tsuneoki's Toyotomi forces, achieving major success. During this conflict, Yasumasa is said to have issued a fiery manifesto sharply criticizing Toyotomi Hideyoshi—leading to the legend that Hideyoshi put a bounty on Yasumasa's head. At Sekigahara (1600) he managed the Hokuriku front for the Eastern forces, facing off against the Uesugi. After the war he received Kozuke-Tatebayashi at 100,000 koku. Highly regarded as an accomplished warrior among the Four Heavenly Kings, Tatebayashi later became famous as the domain of which Tokugawa Tsunayoshi served as lord.