What is "ogboni"

Ogboni (also known as Osugbo in Ijèbú) is a fraternal institution indigenous to the Yoruba language-speaking polities of Nigeria, Republic of Bénin and Togo. A similar group in Igbo-speaking areas is called Okonko (Oko/Eko). The society performs a range of political and religious functions, including exercising a profound influence on regents and serving as high courts of jurisprudence in capital offenses. Its members are generally considered to be part of the nobility of the various Yoruba kingdoms of West Africa.