In the 17th century, taking advantage of this period of Portuguese weakness, the Dutch occupied many Portuguese territories in Brazil. John Maurice, Prince of Nassau-Siegen was appointed as the governor of the Dutch possessions in Brazil in 1637 by the Dutch West India Company. He landed at Recife, the port of Pernambuco, in January 1637. In a series of expeditions, he gradually expanded from Sergipe on the south to São Luís de Maranhão in the north. He likewise conquered the Portuguese possessions of Elmina Castle, Saint Thomas, and Luanda and Angola. The Dutch intrusion into Brazil was long lasting and troublesome to Portugal. The Seventeen Provinces captured a large portion of the Brazilian coast including the provinces of Bahia, Pernambuco, Paraíba, Rio Grande do Norte, Ceará, and Sergipe, while Dutch privateers sacked Portuguese ships in both the Atlantic and Indian Oceans. The large area of Bahia and its city, the strategically important Salvador, was recovered quickly by an Iberian military expedition in 1625.