Lohema was a small mining town that was located on the Twi'lek homeworld of Ryloth. The community became prosperous while digging for ryll and precious metals. The mining operations were run by the Rooshan clan, who consequently became the leaders of the settlement. They enforced a strong work ethic among the miners and inflated their prices. Emen Rooshan, one of the greediest of the Rooshan clan, grew so resentful of the nearby city of Joreikna that he hired assassins to kill some of the ruling clan of that city, the Ku'rys.