Xie Yu was called the Marquis of Ningguo because he had married Princess Liyang, the younger sister of the Emperor of Daliang Kingdom. He had also performed well in the Red Flame Army and gradually gained the Emperor's recognition and reward. Although he was the consort of the Grand Princess of Liyang, he was given the title of Marquis of Ningguo because of his outstanding military achievements. On the door of his mansion, there was even a pillar inscribed by the Emperor of Daliang to protect the country, which showed how much the Emperor valued him.

Xie Yu, the Marquis of Ningguo, fell in the 51st episode of Nirvana in Fire.
Xie Yu, the Marquis of Ningguo, ended up being stoned to death during his exile.
The Marquis of Ningguo and the Duke of Qingguo were both titles of nobility in ancient China. Duke Qingguo was a first-class duke. There were nine people who could be tested in each dynasty, including Song Renzong, Wu Qian, Xia Song, etc. The Marquis of Ningguo was a type of marquis and represented the status of a marquis. According to the search results, it was impossible to determine which position was higher, the Marquis of Ningguo or the Duke of Qingguo.
Xie Yu feared Marquis Yan for the following reasons: First of all, Xie Yuqing's ability and ruthlessness to defeat the enemy single-handedly still existed. Even though Mei Changsu had dissuaded Marquis Yan from killing the Liang Emperor, the boldness of his actions was enough to show that he was extraordinary. In Xie Yu's opinion, other than Marquis Yan, very few people would dare to use such a straightforward method to deal with a country's ruler. Furthermore, Xie Yu knew that seeking immortality and seeking Dao was just an excuse for Marquis Yan to retire. He didn't believe that Marquis Yan would remain silent without avenging his brothers. He couldn't guess what Marquis Yan wanted to do, so he was very afraid. Secondly, in Mei Changsu's plot to topple Xie Yu, when Xie Yu trapped everyone, he did not care even if he knew that Prince Yu was leading troops to rescue them. He originally had the advantage, but because of Marquis Yan's arrival, the patrol camp was forced to retreat. When Xie Yu heard that Marquis Yan had arrived, he hurriedly went to deal with him. It was clear that he knew that if he didn't take charge of the situation, no one could defeat Marquis Yan. This was not only because he had witnessed Marquis Yan's scheming methods from more than ten years ago, but also because Marquis Yan had endured for more than ten years. Xie Yu knew the brotherly love Yan Hou had for Lin Xie and his love for Consort Chen, but Yan Hou was able to endure for so long after the death of his most important person. This kind of scheming made Xie Yu feel afraid. Xie Yu could control Prince Yu, but he could not figure out Marquis Yan. This made him even more afraid of Marquis Yan. The original novel of the TV series " The Unique Empress of Generals " was called " The Rebirth of the Poisonous Empress of Generals." The original plot was equally exciting. You can click on the link below to read the original novel.
Jia Yu was the main character of a time-travel novel. In this story, Jia Yu became the adopted son of Jia Jing of the Ningguo Manor, but he was not valued. However, he had awakened a check-in lottery system, and on his first check-in, he had obtained the Iron Letter Certificate, which was known as the Immortal Gold Medal. Jia Yu used this system to start interfering with the affairs of the Ningguo Manor, successfully stopping Yuan Chun from entering the palace, and played an important role in the Jia Manor. This story described Jia Yu's rise in the Ningguo Manor and his influence on the affairs of the Jia Manor.
There was no clear answer to Marquis Yan and Xie Yu's official positions. Although Xie Yu held a higher position, Marquis Yan possessed great influence and resourcefulness in the court. Thus, in terms of power and influence, Marquis Yan was superior. However, the specific ranks of official positions were not mentioned, so it was impossible to determine the rank of Marquis Yan and Xie Yu.
Xie Yu was a Marquis with real power, while Marquis Yan was an idle noble. Although Xie Yu held a higher official position, he was very wary of Marquis Yan. It was clear that Marquis Yan possessed great influence and resourcefulness in the court. Thus, it could be said that Marquis Yan was superior in terms of power and influence.
Xie Yu's official position was even higher. Although Marquis Yan had great influence and resourcefulness in the court, Xie Yu was a first-grade military marquis and had the trust of the Emperor. She was in charge of the patrol camp and was also the trusted aide of the Crown Prince. Thus, Xie Yu's official position was even higher.