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The first netizen to answer is correct. This couplet was written by Pu, an outstanding novelist in Qing Dynasty, in praise of Sima Qian, the author and great historian of Historical Records of Han Dynasty.

Moreover, netizens perfectly interpreted the last sentence of the couplet: a generation of monarchies injured silkworm houses. Among them, the silkworm house was used to place newly castrated prisoners in the Han Dynasty. Sima Qian made excuses for Li Ling's defeat and surrender, which caused great anger of Emperor Wu of the Han Dynasty. He was finally imprisoned and became a castrated person. Therefore, Pu used monarchical power and silkworm room to refer to this painful history that Sima Qian experienced during the period of Emperor Wu of the Han Dynasty.

But netizens forgot to explain the following sentence: the Millennium history traces back to Longmen.

It can be said that this sentence is the highest praise for Sima Qian. Sima Qian was born in Longmen (the Western Han Dynasty belonged to xia yang, that is, hancheng city in Shaanxi Province and Hejin in Shanxi Province, which is controversial). So use Longmen to refer to Sima Qian. Traceability is traceability. So the whole sentence means that since Sima Qian wrote the immortal Historical Records, historians of later generations have followed Sima Qian's footsteps and compiled historical records according to the norms left by Sima Qian. Therefore, the great achievements of historians are traced back to Sima Qian.