1. Conditions for using "Zu":
(1) the founding emperor;
(2) the ancestors of the founding emperor;
(3) the emperor who completed the transformation from local to state power;
(4) Prosperity and wisdom.
The founding emperor is generally called "MAO" or "MAO"; The emperors in the back are generally called "Zong". Cao Pi was the founding emperor, so both Cao Cao and Cao Pi met the requirements of the title of "ancestor".
2. Because both Cao Cao and Cao Pi are called "ancestors", they cannot be repeated. Before Cao Cao, it was definitely called "Mao", and Cao Pi also used the most common "world". In addition, the proliferation of the term "Zu" started from Cao Wei.
Extended data
Historical origin
The temple name was established as early as Shang Dynasty, and the former king who had made great contributions to the country and was worthy of eternal sacrifice by future generations would especially rush to the temple name to see the significance of eternal sacrifice.
At that time, there were only four temple names: Tai (Taizu Taizong Taijia), Gao (Taizu Wanghai, Wu Ding), Shi (Sejong Pan Geng, Sejong Zujia), Zhong (Taizong Taiwu, saying Zu B), and according to Zu. These are the earliest temple names.
After the demise of Shang Dynasty, the Zhou Dynasty did not continue the temple name system of Shang Dynasty, but continued to develop the posthumous title system of Shang Dynasty. So the monarch of the Zhou Dynasty had a posthumous title without a temple name, and then the first emperor established the first centralized dynasty in China-the Qin Dynasty.
Posthumous title system of temple number will be abolished at the same time, because the decision of "posthumous title of temple number" will form a situation of "the son discusses the father and the minister discusses the monarch", so the law of funeral temple number will be abolished. Therefore, from the Zhou Dynasty to the Qin Dynasty, temple names were abolished for nearly a thousand years.
After the Western Han Dynasty, the temple name system was inherited. The Han dynasty was very cautious about adding temple names, so many emperors didn't have temple names. Liu Bang was the founding monarch, whose temple name was Mao, and the emperor of posthumous title was Gao (there was no word "Gao" in funeral etiquette, so he was called Yan, Qi Emperor and Qin Emperor).
The Han Dynasty emphasized filial piety, so except Liu Bang, posthumous title, the emperor who succeeded to the throne, had the word "filial piety". Emperors in both Han Dynasties had posthumous title, but few temple names, especially in the Western Han Dynasty. Those who have made great contributions cannot have it.
Baidu encyclopedia-temple number