251 Nî: Nî
| chhian-liân-kí: | 1 chhian-liân-kí |
| sè-kí: | 2 sè-kí | 3 sè-kí | 4 sè-kí |
| cha̍p-nî-kí: | 220 nî-tāi | 230 nî-tāi | 240 nî-tāi | 250 nî-tāi | 260 nî-tāi | 270 nî-tāi | 280 nî-tāi |
| nî: | 246 nî | 247 nî | 248 nî | 249 nî | 250 nî | 251 nî | 252 nî | 253 nî | 254 nî | 255 nî | 256 nî |
| Kan-chi | Keng-ngó͘ nî — kàu — Sin-bī nî |
| Gregorius le̍k | 251 nî CCLI |
| Julius le̍k | pí Gregorius le̍k chá 0 kang |
| Hu̍t-le̍k | 795 nî |
| Tō-kàu-le̍k | 2948 nî |
| Hoê-le̍k | 383 BH~382 BH |
| Hông-kì | 911 nî |
| Tân-kì | 2584 nî |
| Hi-pek-lâi-le̍k | 4011~4012 |
| Hindu le̍k | |
| - Vikram Samvat | 306 – 307 |
| - Shaka Samvat | 173 – 174 |
| Iran le̍k | -371 – -370 |
| Runic le̍k | 501 |
| Assyria le̍k | 5001 nî |
| Ethiopia le̍k | 245~246 |
251 nî tī Julius Le̍k-hoat lāi-bīn sī chi̍t ê pêng-nî, thâu kang sī pài-saⁿ.
Liân-hō
Tang A-chiu kun-chú kì-goân
Sū-kiāⁿ
Kok-ka léng-tō-chiá
Chhut-sì
Kòe-sin
- 7 goe̍h 1 ji̍t: Herennius Etruscus, chèng-tī-chiá. Lô-má Hông-tè. 220 nî chhut-sì.
- 7 goe̍h 1 ji̍t: Decius, Kó͘-tāi Lô-má chèng-tī-chiá. Lô-má Hông-tè. 201 nî chhut-sì.
- 11 goe̍h: Hostilianus. Lô-má Hông-tè. 230 nî chhut-sì.
Chham-khó chu-liāu
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