Hyūga Province
However, after the start of the Edo period, Arima Harunobu fell from favour due to Tokugawa Ieyasu's aversion to the Kirishitan faith - the term for the Roman Catholic religion in Japan. This culminated during the Okamoto Daihachi incident, a court intrigue involving Harunobu and the Kirishitan Okamoto Paulo Daihichi. As a result, he was relieved of his offices and sentenced to die by Tokugawa Ieyasu. Although his son, Arima Naozumi was married to an adopted daughter of Tokugawa Ieyasu, at the start of the suppression of the "Kirishitan" religion, he was transferred from Shimabara to Nobeoka Domain (53,000 "koku") in Hyūga Province in 1614. During the Shimabara Rebellion of 1637-1638, he led an army of 4000 troops against the "Kirishitan" rebels, many of whom were former Arima vassals.