《新唐书·列传·卷二十二》
进封左光禄大夫、郑国公。
进左光禄大夫、郑国公。
He was promoted to the rank of Zuo Guanglu Dafu and appointed as Duke of Zheng. 
<s>[INST] Translate the following Classical Chinese text into English: 进左光禄大夫、郑国公。 [/INST] He was promoted to the rank of Zuo Guanglu Dafu and appointed as Duke of Zheng. </s>
Translate the following Classical Chinese text into English: 进左光禄大夫、郑国公。
user
He was promoted to the rank of Zuo Guanglu Dafu and appointed as Duke of Zheng.
assistant