à Âmura Sumitada (大æ ç´Âå¿ , 1533 â June 23, 1587) was a Japanese daimyà  lord of the Sengoku period. He became famous throughout the country for being the first of the daimyo to convert to Christianity following the arrival of the Jesuit missionaries in the mid-16th century. Following his baptism, he became known as "Dom Bartolomeu". Sumitada is also known as the lord who opened the port of Nagasaki to foreign trade.
à Âmura Sumitada was born in 1533, the son of Arima Haruzumi, lord of Shimabara, and his wife, who was a daughter of à Âmura Sumiyoshi. His childhood name was Shà Âdà Âmaru Ã¥ÂÂ童丸. At age 5, he was adopted by his uncle à Âmura Sumisaki, and succeeded to the à Âmura family headship in 1550. As Sumisaki had no legitimate heirs, and the à Âmura clan had its origins in the family line of the Arima, Sumisaki readily adopted the young Shodomaru, who took the name Sumitada at the time of his succession.
Following his succession, he was immediately faced with a multitude of pressures, the greatest of which was the attack from Ryà «zà Âji Takanobu of Hizen-Saga. Sumitada found the answer to his problems in the form of Christianity. In 1561, following the murder of foreigners in Hirado (in the area of influence of the Matsura clan), the Portuguese began to look for other ports where they could trade.
In response to their search, Sumitada offered them safe haven in his domain, at Yokoseura. This cast a great impression on the Portuguese, and particularly on the Society of Jesus (the Jesuits). This they readily agreed to, and soon after, in 1563, Sumitada and his retainers became Christian, and Sumitada took the baptismal name Bartolomeu.
After his conversion Sumitada, under the influence of the Jesuits, ordered the razing of Buddhist temples and Shinto shrines. Sumitada's subjects were forced to convert or be exiled from the domain. Jesuit Gaspar Coelho helped to encourage the destruction of temples and the persecution of non-Christians. The destruction and persecutions were committed due to Sumitada's religious zeal and the Jesuits' insistence that the destruction of the temples and shrines would be the most appropriate way to repay them as the Portuguese helped protect him and his domain. The Jesuits also believed that the firm planting of Christianity would require the institutional and iconographic elimination of local religions.
Sumitada likely pursued Christianity to profit from Portuguese technology and weapons as the Sengoku period was one of political fragmentation and uncertainty. However, after his baptism, Sumitada expressed more interest and genuine devotion to his new faith.
To illustrate Sumitada's devotion to Christianity, the Portuguese Jesuit father LuÃÂs Fróis had once wrote:
Goto Takaakira, an illegitimate son of à Âmura Sumisaki who hated Sumitada, led an uprising against him. During the chaos, Yokoseura was burned, ending the foreign trade there. As a result, in 1570, Sumitada opened the port of Nagasaki to the Portuguese and sponsored its development. When the Ryà «zà Âji attacked Nagasaki in 1578, the Portuguese assisted Sumitada in repulsing them. Following this event, on June 9, 1580, Sumitada ceded Nagasaki "in perpetuity" to the Society of Jesus.
Following Toyotomi Hideyoshi's campaign against the Shimazu clan, the à Âmura were confirmed in their holdings, though Nagasaki was taken from the Jesuits and made into a chokkatsu-ryo, or direct landholding, of the Toyotomi administration.
Sumitada handed over domainal administration to his son Omura Yoshiaki and retired, living in a mansion at Sakaguchi. He died there of tuberculosis, on June 23, 1587. à Âtomo Sà Ârin, another Christian daimyà Â, died within the same month. This was also the year when Toyotomi Hideyoshi banned Christianity in Japan.