Navarrete’s missionary activities came to an abrupt halt in 1664 when a fierce and general persecution broke out. All missionaries were to be brought to Beijing by imperial command and then conducted to Guangzhou. Morever the prohibition of maritime trade along the coastline of Guangdong was to be strictly enforced. Since Aomen was under Chinese jurisdiction, the Portuguese colony would have been subjected to martial law except for the intervention of the Jesuit, Johan Adam von Bell Schall (1591-1666), then in favor at court. While he obtained for Aomen an exemption from the regulation requiring removal inland, the regulation relating to trade and commerce remained in force. Aomen suffered greatly from this control of communication, and in 1667 Portugal decided to send an embassy to alleviate the situation. The ambassador, Manuel de Saldanha (d. 1670), did not have permission to go to Beijing immediately, nor did he bring any tribute with him. Aomen had to furnish this, and to support him, his suite, and his family which accompanied him for two years. The stranded Portuguese embassy was finally granted permission to proceed to the capital in 1670—a decision closely associated with the imperial favor enjoyed by the Jesuits.
Source: wiktionary