 Complete the following phrase:  Friedrich Salomon Halls parents were Moritz and Katarina Hall. Moritz was born in Cracow in partitioned Poland and Katarina was born in Ethiopia to an Ethiopian mother and a German father. The couple met while Moritz was in Ethiopia as a missionary; he later produced cannon for the Ethiopian Emperor Tewodros II. He fell out of favour, was imprisoned by Tewodros and rescued by the 1868 