Wikipedia
Oghwoghwa
Oghwoghwa are the forefathers of four clans in Urhobo Land in Nigeria, namely Ogor (Ogọ) Ughelli (Ughẹne), Agbarha-Otor (Agbarha-Otọ) and Orogun. These are the key and hub of the Urhobos speaking people. Each and every of these clans are headed by a traditional ruler known as King (in Urhobo as Ovie). Each king has their own kingdom with its own historic laws. They derived the weekly and monthly calculations from the local market day known as Ḙdeki. The traditional Sunday, Edewor (Edewọ), is a resting day when there will be no market and no one does any work. Achwẹdẹwọ nu is a day after the resting day that roughly corresponds with Monday. Since the calendar only has five days and not seven several days overlap.