The port was in use in ancient times, but gained in importance after the 12th century. By the 14th century it was arguably the most important port in the country, and it retained this preeminence until 1873 when an artificial harbour was built in Colombo. The great Chinese admiral Zheng He commemorated his visit by leaving a trilingual inscription in 1411; the three languages were Chinese, Tamil, and Arabic, implying a cosmopolitan trading community. The Portuguese arrived in 1505, and later built a small fort; but it was after Galle was captured by the Dutch in 1640 that the city rose to its greatest prosperity. The Dutch rebuilt the town and strengthened the fortifications.