Background
He was the descendant of Nna Uru (a immigrant from Igboland to the Obong Okon Ita area) and king of the Eze Agwu clan centered in their capital the Amanagwu city-state.
He was the descendant of Nna Uru (a immigrant from Igboland to the Obong Okon Ita area) and king of the Eze Agwu clan centered in their capital the Amanagwu city-state.
As new settlers, the Eze Agwu clan was resisted by the regional power Obong Okon Ita which led to the start of the Aro-Ibibio Wars. The war initially became a stalemate. Both sides arranged a marriage between the king of Obong Okon Ita and a woman from the Eze Agwu clan in an attempt for a peaceful coexistence.
The marriage eventually failed to bring peace but eventually played a decisive role in the war.
When he arrived, Nnachi and Eze Agwu allied with prince Kakpokpo Okon of the Ibibio kingdom of Obong Okon Ita. Kakpokpo Okon was the son of the marriage between the Igbo women of the King of Obong Okon Ita.
Nnachi called on an Eastern Cross river group known as the Akpa for help. The Akpa are said to have possessed guns and are credited for introducing the weapon to the region.
Princes Osim and Akuma Nnubi led Akpa soldiers to help fight against the Ibibios.
The alliance between Eze Agwu, Nnachi, Kakpokpo Okon, and the Akpa eventually defeated the Obong Okon Ita forces (1690–1720) under the leadership of Osim Nnubi. As a result of the Aro-Ibibio Wars, the alliance formed the Arochukwu kingdom. Prince Kakpokpo Okon died and the Ulu Okon dynasty was assimilated into the Eze Agwu lineage.
The Amanagwu was incorporated as the first of the 19 city-states of Arochukwu and Eze Agwu became one of the three lineages of Arochukwu.