The Ministry of Household was first called the Ministry of Civil Affairs.

Later, Li Shimin became the emperor, and in order to avoid fame, he changed his name to the household department.

In the Tang Dynasty, the household department generally had one person who was a third-grade Shangshu and two people who were a fourth-grade waiter.

It is mainly responsible for the project, which is the land, the people, the money valley, the soil tribute and the military endowment.

You just go and pull a passer-by and ask him which dynasty in history has the most heroes.

Nine times out of ten, this person will tell you that it is the Tang Dynasty.

In the early Tang Dynasty, even a person with a third- or fourth-grade official position was likely to be a hero.

For example, this household department is still in the book, Ju (ju) Guogong Tang Jian.

If you ask how good this person's life is, it can be described as 'being the protagonist of a novel'.

Grandfather Tang Yong, Ren Beiqi Shangshu left servant.

Father Tang Jian, Sui Rongzhou Assassin History.

Judging from here, this person is a veritable official from a family of eunuchs.

And he studied and practiced martial arts when he was a child, and when he grew up, he followed Li Shimin to fight in the south and the north.

has almost become a hero of Fang Xuanling and Fang Xuanling side by side.

But there is one thing bad about this product, that is, it is too upright.

When playing chess with Li Shimin, Li Shimin didn't say anything about winning, but jumped up and down happily.

As a result, there was no surprise that he was belittled by Li Shimin.

If it weren't for that, he would have to advance at least two or three places in the ranking of the famous ministers.

……

Li Chengqian and Tang Jian also met outside the household department.

Li Chengqian took the lead in stepping forward and bowed his hand: "Shibo." ”

"Your Highness is serious."

"You are a world-class uncle, and the minister can't afford it."

Tang Jian is straightforward and heroic, and does not follow the rules.

But at this time, Li Chengqian suddenly shouted Shibo, which really scared him.

Li Chengqian didn't think about it, and said with a smile: "If Shibo can't afford it, then no one in the world can afford it." ”

He is not saying a false word of flattery.

The Tang and Li families are world friends, and when Li Yuan's generation was in his generation, the relationship was very good.

Therefore, Tang Jian and Li Shimin have known each other for a long time.

When Li Shimin was young, Tang Jian took him around and played everywhere.

Moreover, if it weren't for him secretly pouting Li Shimin.

I'm afraid there will be no matter for Li Shimin to go to Li Yuan to discuss raising troops against Sui.

To put it mildly, if there is no such thing in it.

Whether the Tang Dynasty existed or not is not certain.

Tang Jian looked at Li Chengqian so humble.

He couldn't help but be a little stunned.

He didn't expect Li Chengqian to respect himself so much.

After all, it is said outside that Li Chengqian is a master of absurd things.

But now it seems to be a little different.

Li Chengqian, who was on the side, saw that he was stunned, and couldn't help but call: "Shibo? ”

"Huh?"

Tang Jian came back to his senses and hurriedly said, "Since His Highness has arrived, let's start." ”

Li Shimin has already explained to him.

From today onwards, Li Chengqian will work in the household department centering on the 'theory of nationality.'

But in his understanding, it was nothing more than Li Chengqian coming to study and supervise.

He even expressed doubts about whether the 'nationality theory' was put forward by Li Chengqian.

After all, Li Chengqian, a nine-year-old little doll, what big things can he do?

But thinking like this in his heart, he can't say that.

What if this lord ascends the throne and becomes the emperor in the future?

Although he is upright, he is not stupid.

Therefore, he is still very supportive of Li Chengqian's work.

After entering the household department, he began to mobilize officials from top to bottom and began to work intensively.

First of all, all the household registration materials were moved over and Li Chengqian personally checked them.

And he himself has been standing by Li Chengqian's side.

When Li Chengqian didn't understand anything, he could answer immediately.

Today's household registration information is not comparable to the archives of later generations.

The things recorded on it are, at most, names and places of origin.

Date of birth or anything at all.

Seeing this, Li Chengqian sighed.

It's no wonder that these demographic things will leave so many problems for historians in the future.

This is no different from making things up?

"I'm afraid this thing will have to be redone."

Hearing this, Tang Jian was obviously stunned for a moment.

"Redo?"

"What does Your Highness mean by that?"

"Of course, it's a redo of the household register."

Li Chengqian directly told Tang Jian about his plan to tell Li Shimin again.

Tang Jian suddenly felt that His Royal Highness was talking on paper.

How can a nationwide census be done just by talking?

Tang Jian said directly: "Your Highness, this matter has to be discussed in the long run." ”

"Not to mention how much impact it will have on the country."

"It's not a nationwide census that can be done in a day or two."

After all, for him, the territory of Datang is vast, and the people's residences are scattered.

It is simply impossible to thoroughly investigate the population and distribute the relevant documents.

At this time, he even felt that Li Chengqian was more than just talking on paper.

This is clearly whimsical.

But he knew there that Li Chengqian lived in that era.

Even the poorest family has a thing called the household registration book that records the relevant information of each family member.

There is also a very comprehensive file system to record the relevant experiences of every resident in the country.

Li Chengqian also knows that without the network now, the file system will definitely not be able to do this.

But the hukou book is absolutely feasible.

"If you can't do it in one day or two, you can do it in one year or two years."

"The basis of the nationality theory is to record the relevant information of every Tang person in China."

"So there's no time to wait."

Li Chengqian's attitude is also rarely tough.

If he hadn't known before, he wouldn't have known that the Tang Dynasty's hukou system was so backward.

Even in the household department, which is the place where the people's household registration should be comprehensively recorded, there is not even a complete system.

"But Your Highness."

Tang Jian looked at Li Chengqian with an embarrassed face: "This not only requires dispatching officials across the country to conduct household registration censuses, but also requires a large amount of paper to make household registration forms. ”

"Not to mention the expenses that officials need to spend when investigating household registration, the cost of paper used in making household registration forms alone is already very huge."

"This matter is too big, the minister can't be the master......"

Hearing this, Li Chengqian was stunned.

Immediately, he reacted.

In ancient times, paper was very expensive.

First of all, it can be seen from the deeds of calligraphers of various generations.

First, Wang Xizhi, a famous calligrapher, practiced calligraphy on the ground after becoming famous.

Later, Zhang Xu, one of the "three uniques" of Tang Wenzong's edict, practiced calligraphy on banana leaves.

Even in the Song Dynasty, which was recognized as the richest, the common people could not afford to use paper.

When the scholars of the poor family went to the school, they could only practice writing with shiny stone slabs.

And the paper is really cheap until it is popularized to thousands of households, which is already after the founding of the People's Republic of China.

But paper is expensive, can it stop Li Chengqian?

As a science and engineering man, are there any times when you are stumped by difficulties?

"You don't need to worry about the paper, I'll solve it."

"Shibo only needs to send officials down there to census the population."

Li Chengqian said very confidently.

But Tang Jian had no bottom in his heart.

He felt in his heart that His Highness was messing around.

So after saying goodbye to Li Chengqian, he went directly to the palace to meet Li Shimin.