A maritime tribute network radiating from Yap across over 1,300 km of the Caroline Islands, maintained through the ritual exchange of rai (stone money) and the sawei ceremonial system — unusual among Micronesian polities for its informal but far-reaching socioeconomic influence.
The Yapese maritime sphere and its sawei tribute network were disrupted under German colonial administration after Germany acquired the Carolines from Spain on 3 November 1899; the German administration actively suppressed the sawei system between 1899 and 1914, when Japanese troops occupied Yap in September 1914, effectively ending the Yapese Empire as a functioning polity.
Classic early account of Yap and the stone-money (rai) system that underpinned the Yapese tribute network.
Primary/contemporary traveler's account from the closing year of the polity's lifespan, describing Yap, rai stone money, and the Caroline Islands sawei sphere first-hand.
Era/regional context: an archaeological history of the Pacific including Micronesia that frames the Yap-centered exchange network within deep regional prehistory.