Ieyasu and other Date allies were always suspicious of him, Date Masamune for the most part served the Tokugawa loyally. In 1600, under Tokugawa eastern army, he fought in Sekigahara Campaign at Siege of Shiroishi and Siege of Hasedo. Later, Tokugawa Ieyasu awarded Masamune the lordship of the huge and profitable Sendai Domain, which made Masamune one of Japan's most powerful daimyō. Tokugawa had promised Masamune a one-million koku domain, but, even after substantial improvements were made, the land only produced 640,000 koku, most of which was used to feed the Edo region. In 1604, Masamune, accompanied by 52,000 vassals and their families, moved to what was then the small fishing village of Sendai. He left his fourth son, Date Muneyasu, to rule Iwadeyama. Masamune would turn Sendai into a large and prosperous city. In 1614, he fought in the Osaka campaigns against Toyotomi Clan. Later in 1616, when Tokugawa Ieyasu was on his deathbed, Masamune visited him and read him a piece of Zen poetry. Masamune was highly respected for his ethics; a still-quoted aphorism is, "Rectitude carried to excess hardens into stiffness; benevolence indulged beyond measure sinks into weakness." Death In 1636, Masamune died of a combination of esophageal cancer and peritonitis at the age of 68 years. He was returned to Sendai in the same daimyō procession as when he was alive. The bakufu gave approval for his eldest son, Date Tadamune, to inherit the Date clan territory. Patron of culture and Christianity Masamune expanded trade in the northeastern Tōhoku region. Although initially faced with attacks by hostile clans, he managed to overcome them after a few defeats and eventually ruled one of the largest fiefdoms of the later Tokugawa shogunate. He built many palaces and worked on many projects to beautify the region. He is also known to have encouraged foreigners to come to his land. Even though he funded and promoted an envoy to establish relations with the Pope in Rome, he was likely motivated at least in part by a desire for foreign technology, similar to that of other lords, such as Oda Nobunaga. Further, once Tokugawa Ieyasu outlawed Christianity, Masamune reversed his position, and though disliking it, let Ieyasu persecute Christians in his domain. For 270 years, Tōhoku remained a place of tourism, trade, and prosperity. Matsushima, for instance, a series of tiny islands, was praised for its beauty and serenity by the