The copper coin from the Kilwa Sultanate pre- dates by 800 years the European discovery of Australia.

Archaeologist Mike Hermes says the discovery of the Kilwa coin draws into question who exactly discovered Australia.

Finding how it made the 10 000 km journey  to Northern Australia could turn on its head what we know about global trade.

The Kilwa Sultinate spread from the Horn of Africa down to Mozambique along what is known as the Swahili Coast.

Historian Mike Owen says the coin is the Holy Grail for the Past Masters who’ve been scouring the coastline for rock art, stone tools, shipwrecks and human remains looking for evidence of Australia’s past.

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