Ibadan, coined from the phrase "Eba Odan", which literally means 'by the edge of the meadow', came into existence in 1829, during a period of turmoil that characterized Yorubaland at the time. It was in this period that many old Yoruba cities such as old Oyo (Oyo ile), Ijaye and Owu disappeared, and newer ones such as Abeokuta, new Oyo (Oyo atiba) and Ibadan sprang up to replace them. According to local historians, Lagelu founded the city, and was initially intended to be a war camp for warriors coming from Oyo, Ife and Ijebu. As a forest site containing several ranges of hills, varying in elevation from 160 to 275 metres, the location of the camp offered strategic defence opportunities. Moreover, its location at the fringe of the forest (from which the city got its name) promoted its emergence as a marketing centre for traders and goods from both the forest and grassland areas.