Fishing in China
Ultra rare0.2%Starting as Jarl Hæsteinn in 867, become Hegemon of China
The maddest sentence in the game: a Breton-coast Viking becoming Hegemon of China - and per the wiki the check is PLAYING as Hæsteinn, so it must happen in his lifetime. Needs All Under Heaven. The whole problem is distance versus mortality: Adventure CB out of the King of France's reach (more than once if needed), then puncture a corridor east with ordinary county-conquest CBs - Dalmatia, Sinai, Oman, Gujarat, Bengal, Vietnam - hoarding your special troops, which never repopulate. On reaching the Chinese border you get the Claim the Mandate CB: pick your moment, smash one army decisively, enforce demands, and Hæsteinn takes the Dragon Throne. Mandate of Heaven falls out of the same conquest, and the truly unhinged can layer
The Heavenly Kingdom on top.