Dorgon vs Theodosius I

Upon the death of Hong Taiji, Dorgon was appointed as regent for the young Shunzhi Emperor. This position gave him effective control over the Qing government and military, enabling him to direct the conquest of Ming China.

Dorgon allied with Ming general Wu Sangui to defeat Li Zicheng's rebel forces at Shanhai Pass. This victory allowed Qing forces to enter Beijing and establish the Qing dynasty as the ruling power in China.

Dorgon led Qing forces in a campaign against the Southern Ming regime, capturing Nanjing and defeating the Hongguang Emperor. This campaign extended Qing control over the Yangtze River valley and weakened Ming loyalist resistance.

Dorgon mandated that all Chinese men adopt the Manchu queue hairstyle as a sign of submission to Qing rule. This policy caused widespread resentment and resistance, but was enforced to consolidate Qing control over Han Chinese subjects.

Dorgon died suddenly while hunting. After his death, the Shunzhi Emperor accused him of plotting to usurp the throne, stripped him of all titles, and had his corpse mutilated. This posthumous purge reflected court factional struggles.

Theodosius I issued the Edict of Thessalonica, declaring Nicene Christianity the official state religion of the Roman Empire. All other forms of Christianity were deemed heretical, and pagan practices were increasingly suppressed.

Theodosius I ordered a massacre of thousands of citizens in Thessalonica in retaliation for the murder of a Roman general. The massacre led to his excommunication by Bishop Ambrose of Milan, and he later performed public penance.

Theodosius I issued a series of laws banning pagan worship, closing temples, and prohibiting sacrifices. The Olympic Games were abolished, and the Serapeum in Alexandria was destroyed. These actions accelerated the decline of paganism in the empire.

Theodosius I defeated the usurper Eugenius and his general Arbogast at the Battle of the Frigidus (modern River Vipava). The victory reunited the Roman Empire under a single ruler for the last time before its permanent division.

Upon his death, Theodosius I divided the Roman Empire between his two sons: Arcadius received the Eastern Empire and Honorius the Western Empire. This division became permanent, leading to the separate histories of the Byzantine and Western Roman Empires.