Guangzhou, but he died off mainland China, at Shangchuan Island: although Macau had been granted to Portuguese, contacts with continental China were always cautious and, starting in 1517, several Portuguese embassies were stalled while trying. In 1576 Pope Gregory XIII included Japan in the Portuguese diocese of Macau. In September 1578 Alessandro Valignano arrived at Macau as a visitor of Jesuit Missions in the Indies, to examine and when necessary reorganize, answering to the Jesuit Superior in Rome. No missions had succeeded in establishing in mainland China, while in Japan they multiplied. Language study had always been one of the core problems: in his view, it was necessary first to learn to speak, read, and write the Chinese language. To this end, he wrote to the Superior in India, who sent to Macau Jesuit scholar Michele Ruggieri (羅明堅) who called the help of Matteo Ricci (利瑪竇), to share the work. Ricci joined him in Macau in 1582. and together, they become the first European scholars of China and the Chinese language. In 1579 Valignano made his first visit to Japan. Before the Visitor arrived, seventeen of Valignano's personally appointed missionaries wrote to him complaining that language training was totally nonexistent. Lacking fluency in the Japanese language, Francis Xavier had limited to reading aloud a Japanese translation of a catechism, however Jesuits established several congregations. In 1563 Oda Nobunaga favored Jesuit missionary Luís Fróis, and generally tolerated Christianity. It was Valignano's first official act upon arriving in Japan that all new missionaries in the province spend two years in a language course, separating these newcomers by leaps and bounds from the first enthusiastic but stilted efforts of Francis Xavier. On 9 June 1580 Ōmura Sumitada ceded jurisdiction over Nagasaki and Mogi to the Society of Jesus. On August 25, the armies of Philip II of Spain won the Battle of Alcântara, claiming the throne of Portugal and accomplishing the union of the empires so feared in Macau and Nagasaki, as it threatened the Chinese permission to stay in Macau, and challenged their carefully built trade monopoly as it opened to the Spanish based in the Philippines. In 1582, from Japan, Valignano sent an embassy to the Pope and the kings of Europe sponsored by Kirishitan daimyos Sumitada, Ōtomo Sōrin and Arima Harunobu, whom he accompanied via Macau to Goa. In 1583, the Portuguese in Macau were permitted to form a Senate