The Betsimisaraka ("the many inseparables") are the second largest ethnic group in Madagascar after the Merina and make up approximately fifteen percent of the Malagasy people. They occupy a large stretch of the eastern coastal region of Madagascar, from Mananjary in the south to Antalaha in the north. The Betsimisaraka have a long history of extensive interaction with European seafarers, pirates and bourgeois traders, which produced a significant subset with mixed European-Malagasy origins, termed the zana-malata. European influence is evident in the local valse (waltz) and basesa musical genres, which are typically performed on the accordion. Tromba (spirit possession) ceremonies feature strongly in Betsimisaraka culture.
Through the late 17th century, the various clans of the eastern coastal region were governed by chieftains who typically ruled over one or two villages. A zana-malata pirate named Ratsimilaho emerged to unite these clans under his rule in 1710. His reign lasted 50 years and established a sense of common identity and stability throughout the kingdom. But his successors gradually weakened this union, leaving it vulnerable to the growing influence and presence of European and particularly French settlers, (slave traders), missionaries and merchants. The fractured Betsimisaraka kingdom was easily colonised in 1817 by Radama I, king of Imerina who ruled from its capital at Antananarivo in the Central Highlands. The subjugation of the Betsimisaraka in the 19th century left the population relatively impoverished; under colonisation by the French (1896-1960), a focused effort was made to increase access to education and paid employment working on French plantations. Production of former plantation crops like vanilla, ylang-ylang, coconut oil, and coffee remain the principal economic activity of the region beyond subsistence farming and fishing, although mining is also a source of income.