How did Mwene-Mutapa empire formed?

The Kingdom of Mutapa Empire (Shona: Wene we Mutapa; Portuguese: Monomotapa) was a medieval kingdom (c. 1450-1629) which stretched between the Zambezi and Limpopo rivers of Southern Africa in the modern states of Zimbabwe and Mozambique. A second Mutapa polity existed from 1803 until 1902. Its founders are culturally and politically related to the builders who constructed Great Zimbabwe. In the early seventeenth century, the Portugal Portuguese arrived in the area eventually colonizing what is now Mozambique. After gaining control of the Monomotapa in the early years of the century they were later driven out after a defeat in 1693. Rumor associated Monomotapa with the fabled city of the Biblical Queen of Sheba. The high plateau area does in fact have rich gold deposits. This may explain why early European maps of Africa often identify the territory. The empire was largely built on trade exporting copper and ivory. Initially, the Portuguese took part in this trade by transporting goods further to the East, to India.