April 8. (November) — Antiochus III leads an army into Greece to challenge Roman control, at the invitation of the Aetolians, starting the Roman-Syrian War. 191 BC: (April 24) Battle of Thermopylae: Manius Acilius Glabrio drives Antiochus III out of Greece. 190 BC: (December or January 189 BC) Battle of Magnesia: Rome and Pergamon drive Antiochus III out of Asia Minor. 180s BC 189 BC: Galatian War: Gnaeus Manlius Vulso and Pergamon defeat the Galatians. 188 BC: (September 26) Prince Liu Gong, the 5-year old younger brother of Emperor Hui becomes the third Han dynasty Emperor of China upon his brother's death, taking the regnal name of Emperor Qianshao. Because of his minority, his grandmother, Empress Lü continues as the actual ruler and serves as the regent. 187 BC: (July 3) Seleucid king Antiochus III dies at the age of 53 and is succeeded by his son Seleucus IV Philopator. 186 BC: Ptolemy V defeats Ankhwennefer and regains control of Upper Egypt. 185 BC: Pushyamitra Shunga assassinates the last Maurya emperor, founding the Shunga dynasty. 184 BC: (June 15) Emperor Qianshao of Han, the 11-year old nominal ruler of China, is removed, imprisoned and then put to death on order of his grandmother, Empress Lü. Prince Liu Hong, the brother of Qianshao, is installed by the regent as the new Emperor, under the name of Emperor Houshao. 183 BC: Zhao Tuo of Nanyue declares himself Emperor and attacks China. 180 BC: (November 14) Lü Clan Disturbance: with the death of Empress Lü of China, the nominal Houshao is killed along with the rest of the Lü Clan. Another son of Gaozu, the first Han emperor, Prince Liu Heng, becomes the fifth Han emperor and takes the name of Emperor Wen. 170s BC 179 BC: Zhao Tuo of Nanyue makes peace with Han China. Upon the death of Philip V, Perseus becomes king of Antigonid Macedon. 178 BC: Tiberius Sempronius Gracchus ends the First Celtiberian War. 176 BC: The Xiongnu defeat the Yuezhi, who subsequently emigrate from Gansu to the Qilian Mountains and the Ili valley. 175 BC: (September 3) Upon the assassination of Seleucus IV Philopator, his brother Antiochus IV Epiphanes takes possession of the Seleucid throne. 171 BC: At the prompting of the Attalid king Eumenes II, the Romans declare war on Perseus, beginning the Third Macedonian War. 160s BC 168 BC: Third Macedonian War: Roman victory in the