八十一年
公元八十一年者，平年也，繼八十年，下八十二年。
| 干支 | 辛巳 |
| 生肖 | 蛇 |
| 《民報》軒轅 | 二七七九 |
| 《江蘇》軒轅 | 二五七二 |
| 唐堯 | 二二三七 |
| 共和 | 九二二 |
| 孔曆 | 六三二 |
| 秦曆 | 三〇二 |
| 日本皇紀 | 七四一 |
| 韓國檀君 | 二四一四 |
| 道曆 | 二七七八 |
| 佛曆 | 六二五 |
大事
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歿
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