The Benin Kingdom reached the height of its power during the reign of:

The Benin Kingdom, one of the most prominent pre-colonial states in West Africa, reached the height of its power and cultural achievement during the reign of Oba Esigie in the early to mid-16th century (approximately 1504-1550).

Oba Esigie's reign marked a golden age for the Benin Kingdom. He expanded the empire's territory, strengthened its military, and developed diplomatic and trade relations with the Portuguese, who had arrived on the West African coast in the late 15th century. Under Esigie, the kingdom became a major centre of art, producing the famous Benin Bronzes - intricate brass and bronze sculptures that are now recognised as masterpieces of African art. He also promoted education and is credited with establishing a more sophisticated administrative structure.

Oba Oranmiyan is traditionally regarded as the founder of the present Benin dynasty, having come from Ile-Ife to establish the second dynasty. Oba Eweka I was Oranmiyan's son and the first fully Benin-born Oba of the new dynasty, but this was an early formative period, not the kingdom's peak. Oba Ovonramwen was the Oba at the time of the British Punitive Expedition of 1897, which destroyed Benin City and ended the kingdom's independence - representing its decline, not its height.

The correct answer is Oba Esigie, under whose rule the Benin Kingdom achieved its greatest political, military, and cultural prominence.