What happened 221 AD

Liu Bei declared himself emperor of Shu Han.

Ptolemy IV Philopator was the fourth pharaoh of Ptolemaic Egypt from 221 to 204 BC.

King Zheng of Qin conquered the last of his opponents and unified China as the First Emperor of the Qin dynasty ("Qin Shi Huang") in 221 BC. Intending to impose centralized rule and prevent the resurgence of feudal lords, he ordered the destruction of the sections of the walls that divided his empire among the former states. To position the empire against the Xiongnu people from the north.

King Zheng ordered the building of new walls to connect the remaining fortifications along the empire's northern frontier. "Build and move on" was a central guiding principle in constructing the wall, implying that the Chinese were not erecting a permanently fixed border.

Egyptian nationalism reached a peak in the reign of Ptolemy IV Philopator (221–205 BC), when a succession of native self-proclaimed "Pharoah" gained control over one district.

In 221 BC, Ptolemy III died and was succeeded by his son Ptolemy IV Philopator, a weak king whose rule precipitated the decline of the Ptolemaic Kingdom.

The Heirloom Seal of the Realm was carved.

Qin conquered Qi.