In the same regime change, some people find out right away, while others are still paying taxes to the old regime seven months later.

When it comes to a change of dynasty, history books usually just write one line about it. But for the people living on this land, the time it takes to “find out” varies greatly. And this delay isn’t measured in days—it’s measured in months, years, and in some extreme cases, even generations.

The Ming Dynasty had official rules about how long it should take for government documents to reach different places from Beijing. It took 20 days to reach Jinan and Taiyuan, 40 days to Nanjing, 53 days to Hangzhou, 113 days to Guangzhou, 120 days to Yunnan, 135 days to Guiyang, and 145 days to Chengdu. The most extreme case was Jianchangwei in Sichuan—nowadays Xichang—where it took 186 days, half a year, for the order to reach the local government. And that’s just the time for the order to get to the local office; the common people still had to wait much longer to hear about it.

Given this system, the actual reactions to a change of dynasty varied wildly from place to place—so much so that it’s almost absurd.

〔Capital city: Same day, or that night〕

On March 19, 1644, Li Zicheng captured Beijing and Emperor Chongzhen hanged himself. The people of Beijing were the “first witnesses.” Streets changed instantly, officials switched allegiances, and there was no need to spread the news.

〔Suburbs near the capital: Three days〕

Thanks to the official postal system, villages within a hundred miles of Beijing learned about the fall of the city in about three days. This was the closest “information advantage” to the center of power.

〔Jiangnan region: Around a month, but with regional differences〕

The news of Beijing’s fall reached the officials in Nanjing around mid-April. In other parts of Jiangnan, it took until late April or early May. In Fujian, people didn’t know until late May. Ji Liuqi from Wuxi recorded a more detailed account: on April 27, he was still watching a play at his uncle’s house and only heard that “the northern capital was in danger,” not realizing it had already fallen. It wasn’t until April 29 that someone told him clearly that “Emperor Chongzhen had hanged himself on Meishan.” From March 19 to April 29, 40 days had passed.

〔Remote mountains and Tusi territories in the southwest: At least seven months, and they kept using the old era name〕

Local records from the late Ming period show that by winter of the first year of the Shunzhi era, seven months after Beijing fell, many villages and Tusi areas in Yunnan and Guizhou that were far from main roads still used the Chongzhen era name. People continued paying taxes and following Ming rituals as usual, unaware that the regime had changed in the central plains. In some extreme cases, certain remote Tusi rulers in Yunnan even continued using the Chongzhen era name after Shunzhi ascended the throne. For them, a “change of dynasty” wasn’t an event—it was a fact recognized much later.

〔Western regions: It took five years to realize the era name had changed twice〕

After the An Lushan Rebellion, Tang forces in the Western Regions lost contact with the mainland due to Tibetan blockades. Documents unearthed in Turpan show that Tang soldiers there continued using the “fourth year of Guangde” in their records even after 768—five years later—when the emperor had already changed from Xuanzong and Suzong to Daizong. They weren’t “disloyal”; they simply had no way of knowing. Every envoy sent to contact the court was intercepted in the desert or by the Tibetans, so news couldn’t get through.

〔Late Qing period: Telegrams arrived, but remote areas still lagged behind〕

By the late Qing period, things started to differ. In coastal areas, thanks to telegraphs and newspapers, people learned about the abdication of Empress Dowager Longyu in about three days. But in Sichuan-Tibet and Qinghai pastoral areas, it still took five to six months. Some tribes in Outer Mongolia were still using the Xuantong era name as late as autumn 1912.

Put these examples side by side: the capital on the same day, the suburbs in three days, Jiangnan in a month, Lingnan and the southwest in months, and the Western Regions in years. A change of dynasty never happens simultaneously across space. It spreads outward from the center of power, and the farther away you are, the slower it takes. The speed of the postal system set the limit for official information, while geographical barriers and sparse administration determined how long it took for ordinary people to find out.

What’s more, during times of war, this already fragile system broke down even further. Post stations burned down, roads were cut off, messengers fled, and people in remote areas could only piece together news from merchants, refugees, and wandering monks. During peaceful transitions, the new dynasty could send down edicts and new calendars through the postal system, and local governments could change systems within a month or two. But once war broke out, information reverted to oral传，making it hard to tell what was true and causing delays measured in years.

So, the real answer to “How did ancient people know about a change of dynasty?” isn’t found in notices or postal stations—it depends on how far away you were from the center of power. People living on the same land in the same year might actually be living in different “dynasties.” The capital was already using a new era name, Jiangnan was still waiting for confirmation, and a farmer in the mountains was still paying taxes according to the old calendar. History books say “In a certain year, a new dynasty was established,” but the real historical experience is a long chain of delays and distortions stretching from the center to the edges.