sentences:  In 536, the 15-year-old Gao Cheng, who was then with his father at his military headquarters of Jinyang, requested permission to become in charge of the Eastern Wei imperial government at Yecheng.Gao Huan initially refused, but Gao Huan's assistant Sun Qian (孫搴) spoke on Gao Cheng's behalf, and finally Gao Huan agreed.Gao Cheng soon arrived at Yecheng and took over the imperial administration.