History of Africa usually governed by an "oba" and an "iwarefa", a council of chiefs who advised the "oba." by the 18th century, the Yoruba city-states formed a loose confederation, with the "Oni" of Ife as the head and Ife as the capital. As time went on, the individual city-states became more powerful with their "obas" assuming more powerful spiritual positions and diluting the authority of the "Oni" of Ife. Rivalry became intense among the city-states. The Oyo Empire rose in the 16th century. The Oyo state had been conquered in 1550 by the kingdom of Nupe, which was in possession of cavalry,
Empire: Wargame of the Century interface. Starting around 1987, "Empire: Wargame of the Century" on the Atari ST, Amiga, Commodore 64, Apple II, Macintosh and DOS was produced. In its review of the game, "Computer Gaming World" noted the improved UI, saying "the playability of an already successful system has been significantly enhanced". The game would later receive the magazine's "Game of the Year" award for 1988; in 1989 the magazine named "Empire" to its Hall of Fame for games readers rated highly over time, with a final score of 9.71 out of 12, in 1990 readers voted for the game as their "All-Time Favorite",