<Ul> <Li> Bride buying </Li> <Li> Wife selling </Li> </Ul> <Tr> <Td> Historical (show) <Dl> <Dt> Antiquity </Dt> </Dl> <Ul> <Li> Ancient Rome </Li> <Li> Babylonia </Li> <Li> Ancient Greece </Li> </Ul> <Dl> <Dt> Topics and practices </Dt> </Dl> <Ul> <Li> Atlantic slave trade <Ul> <Li> Middle Passage </Li> </Ul> </Li> <Li> Arab slave trade <Ul> <Li> Ghilman </Li> <Li> Mamluk </Li> <Li> Saqaliba </Li> </Ul> </Li> <Li> Aztec </Li> <Li> Blackbirding </Li> <Li> Byzantine Empire </Li> <Li> Coolie </Li> <Li> Corvée labor </Li> <Li> Field slaves in the United States </Li> <Li> House slaves </Li> <Li> Kholop </Li> <Li> Medieval Europe </Li> <Li> Panyarring </Li> <Li> Thrall </Li> <Li> Serfs <Ul> <Li> History </Li> <Li> Russia </Li> </Ul> </Li> <Li> Slave market </Li> <Li> Slave raiding </Li> <Li> Child soldiers </Li> </Ul> <Dl> <Dt> Naval </Dt> </Dl> <Ul> <Li> Galley slave </Li> <Li> Impressment </Li> <Li> Pirates </Li> <Li> Shanghaiing </Li> <Li> Slave ship </Li> </Ul> </Td> </Tr> <Dl> <Dt> Antiquity </Dt> </Dl> <Ul> <Li> Ancient Rome </Li> <Li> Babylonia </Li> <Li> Ancient Greece </Li> </Ul>

Which country was a base for portuguese slave trade in the 1400s