《汉书·传·西域传下》
光武帝考察古今历史，根据当时的形势，采取羁縻政策，不同意派出西域都护，亦遣回各国的质子。
圣上远览古今，因时之宜，羁縻不绝，辞而未许。
Emperor Guangwu studied the ancient and modern history and according to the situation at that time, adopted the "羈縻" policy, did not agree to dispatch a westward protector, and also sent back hostages from various countries.