The islands were only formally possessed by Spain for much of their colonial history, and on European maps were grouped with the Caroline Islands which today make up Palau and the Federated States of Micronesia, or alternatively the "Nuevas Filipinas" ("New Philippines"). The islands were mostly left to their own affairs except for short-lived religious missions (documented in 1668 and 1731) during the 16th and 17th centuries. They were largely ignored by European powers except for cartographic demarcation treaties between the Iberian Empires (Portugal and Castilian Spain) in 1529, 1750 and 1777. The archipelago corresponding to the present-day country was independently named by Krusenstern, after British explorer John Marshall, who visited them together with Thomas Gilbert in 1788, en route from Botany Bay to Canton with two ships of the First Fleet, and started to establish German and British trading posts, which were not formally contested by Spain.