sentences:  In the Marca area, various pillar tombs exist, which local tradition holds were built in the 16th century, when the Ajuran Empire's naa'ibs governed the district.The late 15th and 17th centuries saw the arrival of Muslim families from Arabia, Persia, India and Spain to the Ajuran Empire's, the majority of whom settled in the coastal provinces.Some migrated because of the instability in their respective regions, as was the case with the Hadhrami families from the Yemen and the Muslims from Spain fleeing the Inquisition.