An Qingxu
An Renzhi was physically strong and capable in mounted archery. It is not known when An was born, although he was said to be not yet 20 when Emperor Xuanzong gave him the mostly honorary title of minister of vassal affairs, likely in 751. He was An Lushan's second son, and his mother was An Lushan's first wife Lady Kang. At some point, Emperor Xuanzong gave him the name of Qingxu. The first definitive historical references to him were in 752, when, in a defeat that An Lushan suffered against the Xi, An Lushan was said to have fallen into a hole and was only saved through the effort of An Qingxu and others. Also that year, when An Lushan's close associate Ji Wen (吉溫) went to meet An Lushan before departing for the Tang capital Chang'an, it was An Qingxu that An Lushan sent to accompany Ji to the borders of his territory.