|Predecessor||Adolo (r. 1848–1888)|
Born in circa 1857, he was the son of Ọba Adọlọ, he took the name Ovọnramwẹn Nọgbaisi at his enthronement in 1888, every Ọba took a new name at his coronation, the name translates as Ovọnramwẹn meaning "The Rising Sun" and Nọgbaisi meaning "which spreads over all".
At the end of the 19th century, the Kingdom of Benin had managed to retain its independence and the Ọba exercised a monopoly over trade which the British found irksome. The territory was coveted by an influential group of investors for its rich natural resources such as palm-oil, rubber and ivory. The kingdom was largely independent of British control, and pressure continued from figures such as Vice-Consul James Robert Phillips and Captain Gallwey (the British vice-Consul of Oil Rivers Protectorate) who were pushing for British annexation of the Benin Empire and the removal of the Ọba.
A British invasion force headed by Phillips set out to overthrow the Ọba in 1896. The force's weapons were hidden in baggage, with troops disguised as bearers. Phillips plan was to gain access to Ovonramwen's palace by announcing that he intended to negotiate. Ovonramwen's messengers issued several warnings not to violate Benin territorial sovereignty, claiming he was unable to see Phillips due to ceremonial duties. Having been warned on several further occasions on the way, Phillips sent his stick to the Ọba, a deliberate insult designed to provoke the conflict that would provide an excuse for British annexation. Phillip's expedition was ambushed and all but two were killed. Subsequently, a military operation against Benin in 1897 led by Harry Rawson resulted in the burning of Benin City, the destruction and looting of the royal palaces, and the deaths of untold numbers of its inhabitants. Although the British had orders to hang the Ọba, Ovonramwen escaped, but returned to the city to formally surrender on 5 August 1897. When Ovọnramwẹn returned to the city, after six months spent in evading capture in the forest, he was richly dressed and laden with coral beads and accompanied by an entourage of seven hundred to eight hundred people.  He attempted to escape exile by offering Consul General Ralph Moor 200 puncheons (barrels) of oil worth £1500 at that time and to disclose where his 500 ivory tusks were buried (of a value of more than £2M at that time) however this offer was dismissed as Mr. Moor had already discovered them.
Ovonramwen was exiled to Calabar with two of his wives, Queen Egbe and Queen Aighobahi. He was received and hosted in Calabar in a small town called “Essien Town” by Etinyin Essien Etim Offiong, the progenitor of Essien Town. He died in Calaba around the turn of the new year in 1914. Ovọnramwẹn was eventually buried in the grounds of the royal palace in Benin City.  He was succeeded by his first son and legitimate heir, Prince Aguobasimwin, who ruled as Eweka II. 
- Eweka, Iro (1998). Dawn to Dusk: Folk Tales from Benin. Taylor & Francis. ISBN 9780714643625.
- Oba of Benin Archived 2012-04-07 at the Wayback Machine, Edostate.org, accessed March, 2012
- Thomas Uwadiale Obinyan, The Annexation of Benin, in Journal of Black Studies, Vol. 19, No. 1 (Sep., 1988), pp. 29-40
- Sven Lindqvist, Exterminate All the Brutes, p.57-62
- Walthall, Anne (2008). Servants of the Dynasty: Palace Women in World History. University of California Press. ISBN 9780520254435.
- Roth H. L. Great Benin Its Customs, Art and Horrors, 1903, appendix 111 pp xvii.
- Kaplan, Flora Edouwaye S. (2004). "Sacrifice and sanctity in Benin". In Olupona, Jacob Kẹhinde (ed.). Beyond Primitivism: Indigenous Religious Traditions and Modernity. Psychology Press. ISBN 9780415273190.
- Kaplan, Flora Edouwaye S. (2008-06-10). "Politics in an African Royal Harem: Women and Seclusion at the Royal Court of Benin, Nigeria". In Walthall, Anne (ed.). Servants of the Dynasty: Palace Women in World History. University of California Press. ISBN 9780520254435.
- "Miscellaneous views in Calabar, Opobo and Sierra Leone, circa 1912-1913 - King Ovonramwen of Benin and wives". Janus. Retrieved 2007-03-17.
- Antiquities from the city of Benin and from other parts of West Africa in the British Museum, a catalog from The British Museum (fully available online as PDF), which contains material from the period Ovonramwen ruled