Following the enthronement of Patriarch Teklehaimanot to replace Patriarch Tewophilos, Abba Teklemariam was appointed to serve as the Patriarchal Vicar to the new Patriarch, and functioned as his closest aide. In 1978, as the Derg identified the senior Archbishops and Bishops with the fallen Imperial government, it ordered that all the senior hierarchs go into retirement. As a result, Patriarch Abune Tekle Haimanot had to anoint 14 new bishops to fill the vacancies left by the retiring hierarchs.