During the process of colonisation, between 1870 and 1900, the Oromo population was reduced from ten to five millions. This period coincides with the occupation of Oromo land by the Abyssinian emperors Yohannes and Menilek. After colonisation, these emperors and their successors continued to treat Oromo with utmost cruelty. Many were killed by the colonial army and settlers, others died of famine and epidemics of various diseases or were sold off as slaves. Those who remained on the land were reduced to the status of gabbar (a peasant from whom labour and produce is exacted and is a crude form of serfdom).