8 dated entries naming Liaodong Peninsula, drawn from 8 separate years between 222 BCE and 1214 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.
Also written as Liaodong in the source articles; Wikipedia redirects those to the same subject, so their entries are on this page.
222 BCEThe Qin generals Wang Ben and Li Xin conquer Liaodong, thereby completing the subjugation of Yan.source
2nd century
184King Gogukcheon (Gaonanwu) of Goguryeo (Gaogouli) pushes Chinese armies back to Liaodong.source
3rd century
204Gongsun Kang, Chinese warlord of Liaodong, establishes the Daifang Commandery in northern Korea.source
229Eastern Wu merchants reach Vietnam; ocean transport is improved to such an extent that sea journeys are made to the Liaodong Peninsula and the island of Yizhou.source
4th century
333Murong Hui, Chinese chieftain and duke of Liaodong (b. 269)source
5th century
404Gwanggaeto the Great of Goguryeo (Korea) attacks Liaodong and takes the entire Liaodong Peninsula.source
7th century
677Tang China declares the deposed Bojang of Goguryeo "King of Joseon", placing him in charge of the Liaodong area under the Protectorate General to Pacify the East.source
13th century
1214In his campaigns in Liaodong, the Mongol general Muqali (or Mukhali) forms a newly Khitan-Chinese army and a special corps of some 12,000 Chinese auxiliary troops.source