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,
History of the Jews in 18th-century Poland an independent country. The great bulk of the Jewish population was transferred to Russia, and thus became subjects of that empire, although in the first half of the 19th century some semblance of a Polish state was preserved, greatly diminished, especially in the form of the Congress Poland (1815–1831). History of the Jews in 18th-century Poland The 18th-Century for the Jews of Poland was a tumultuous period as political unrest in the Polish–Lithuanian Commonwealth led to changes in the treatment and behavior of Jews living within its territory. The ascent of the Wettin dynasty to the Polish throne, as well