#OTD in 220 CE: Cao Pi 曹丕 (Wei Emperor Wen #魏 文帝, 187–226), son of Cao Cao #曹操, accepts the abdication of Liu Xie 劉協 (Han Emperor Xian 漢獻帝, 181–234) after declining three times following the custom of #三讓, ending over 400 years of Han #漢 rule. #ChineseHistory #禪讓