 The survivors, including Tristan, were shipwrecked for a decade until 1537 when they were brought back by a Portuguese ship to Lisbon.There are records of Chinese slaves in Lisbon as early as 1540.According to modern historians, the first known visit of a Chinese person to Europe dates to 1540 (or soon after), when a Chinese scholar, apparently enslaved by Portuguese raiders somewhere on the southern China coast, was brought to Portugal.