Demons of Ohara

The Demons of Ohara (オハラの悪魔達) were a group of scholars and archaeologists who resided on the island of Ohara in West Blue. The Ohara clan dedicated itself to the study of the past, something the World Government was uneasy about but tolerated so long as no research was conducted on the Void Century and the Poneglyphs that held its secrets. They were called "demons" by the World Government for daring to study the forbidden history, which, by Government regulations, is capable of world destruction.

Demons of Ohara
After discovering Nico Olvia and numerous other Ohara scholars on their six year journey to research the Poneglyphs, the World Government concluded that it was too risky to allow the Ohara Clan as a whole remain and a Buster Call was initiated. In order to preserve their reputation the World Government spread the lie that the Ohara Clan were attempting to revive the ancient weapons of mass destruction: Pluton and Poseidon, earning the Clan the nickname the "Demons of Ohara" and the resentment of the world.

This term has led to a hard life for Nico Robin, the only known survivor of the Ohara Clan, who for that simple reason is hated and feared by nearly all who meet her, the "Demon Child" nickname even stems from her association with the Ohara Clan.

History
Exactly how long the Ohara Clan has existed is unknown though the Tree of Knowledge, the great library on Ohara is said to be over 5,000 years old and was apparently planted by the Oharans. The Clan has at the very least been around since the end of the Void Century 800 years ago and were one of the few groups to study it despite this being made a serious criminal offence by the World Government.

When Robin was just 2 years old her mother Olvia and numerous other Oharans set out on a journey to study the Poneglyphs to try and discover more of the Void Century, however during the six year journey the expedition is discovered by the Marines and all but Olvia are killed. Knowing the Marines would link the expedition back to Ohara, Olvia returned to try and warn its citizens but is ultimately too late.

The Ohara Clan met its end 20 years before the current story in the Ohara Incident, in 1502 AOP when a Buster Call is used against the island for researching the Poneglyphs turning it into a charred wasteland, and causing the death of all its inhabitants excluding Nico Robin.