European exploration of Africa
One of the ships under command of Diogo Dias arrived at a coast that was not in East Africa. Two years later, a chart already showed an elongated island east of Africa that bore the name Madagascar. But only a century later, between 1613 and 1619, did the Portuguese explore the island in detail. They signed treaties with local chieftains and sent the first missionaries, who found it impossible to make locals believe in Hell, and were eventually expelled.
Alamagan
Alamagan was once settled by the Chamorros, who left behind archaeological evidence including stone columns (called latte stones) and ceramics. From a European perspective Alamagan was discovered in 1669 by the Spanish missionary Diego Luis de San Vitores who named it "Concepción" (Immaculate Conception in Spanish). It is likely that it was previously visited in 1522 by the Spanish sailor Gonzalo de Vigo, deserter from the Magellan expedition in 1521, and was the first European castaway in the history of the Pacific. In 1695, the natives were forcibly removed to Saipan, and three years later to Guam.