evidence: Around 610 AD (during the reign of Emperor Yang of Sui), residents in coastal areas of the mainland began to migrate to Penghu. Later in the middle of the 12th century, the government of the Southern Song Dynasty (1127-1279) put Penghu under the administration of Jinjiang county, Quanzhou of Fujian, and sent troops to guard the territory. In 1335 AD, the government of the Yuan Dynasty (1271-1368) officially set Penghu Xunjiansi, an agency of local administration and inspection under Tong’an county (now Xiamen) of Fujian's Quanzhou, to deal with civil affairs in Penghu and Taiwan. During the Song and Yuan dynasties, mainland residents along the coastal areas began to move to Taiwan for land reclamation. The migration’s frequency and scale gradually increased during the Ming Dynasty (1368-1644). [...] At the ceremony, the representative of China accepting the surrender announced on behalf of the Chinese government that Taiwan and the Penghu Islands were officially again incorporated into the territory of China, and all land, people and administration were put under Chinese sovereignty from that day. With great joy, Taiwan compatriots celebrated its return to the motherland.