Diwa

Diwa was a civilization in eastern Roscia on the Henet peninsula flourishing in the 2nd millennium BCE. It was destroyed in events linked to the 9th-century BCE crisis by around the 7th century BCE. The Uko of the Oda Sea coast further south were their cultural successors.

Diwa culture extensively practiced apeje as the basis of social exchange, although preceding cultures already gave the practice great ceremonial and recorded importance. Property and status were freely gambled and gained at a 'naming market'. Diwa-related practices defined many aspects of southern Roscian customs well into the early 2nd millennium CE.

While the proximate cause of its destruction was an invasion of Guto people from the north, there were also social and political tensions which incubated early forms of ibo, possibly due to the accumulation of status by patricians through apeje. The fall of Diwa largely took the form of displacement of its inhabitants south to the Oda littoral than outright conquest.