What is 640 ad?

In the year 640 AD, several significant events took place around the world. Here are some of them:

1. Construction of the Grand Canal in China: Emperor Yang of the Sui Dynasty ordered the construction of a massive canal that connected the Yellow River and the Yangtze River. The project took six years to complete and was a major feat of engineering. The canal facilitated trade, transportation, and communication across China.

2. Rise of Islam: In Arabia, the Prophet Muhammad continued to spread his message and consolidate his power. In 640, the Battle of Nahawand occurred between the Arab forces and the Persian Sassanid Empire. The Arabs won and gained control of the cities of Iraq, which had been under Persian rule for centuries.

3. Death of Pope Severinus: Severinus was the 71st pope of the Catholic Church, and he served only for a few months before his death in 640 AD. He is mainly remembered for his attempts to reconcile the Eastern and Western churches and for his charitable works.

4. Tang Dynasty in China: The Sui Dynasty was overthrown by Li Yuan, who established the Tang Dynasty. The Tang Dynasty would rule China for the next three centuries and would become one of the most prosperous and innovative eras in Chinese history.

5. Collapse of the Mayan Empire: In Mesoamerica, the Mayan civilization began to decline due to a combination of factors, including overpopulation, environmental degradation, and political instability. Mayan cities such as Tikal and Calakmul were abandoned, and the civilization would never fully recover.

These are just a few of the significant events that took place in the year 640 AD, reflecting the complex and diverse history of different regions of the world.