《新唐书·列传·卷七十五》
太子文学是太子洗马的副手，常衮亲戚任太子文学职，俸禄比太子洗马还多。
太子文学为洗马副，衮姻家任文学者，其给乃在洗马上。
The imperial tutor was the vice minister of the imperial tutor to the crown prince. Chang Gun had a relative who was the imperial tutor and received more salary than the imperial tutor to the crown prince