1721 ni

chhian-lian-ki :	2 chhian-lian-ki
se-ki :	17 se-ki \| 18 se-ki \| 19 se-ki
cha?p-ni-ki :	1690 ni-t?i \| 1700 ni-t?i \| 1710 ni-t?i \| 1720 ni-t?i \| 1730 ni-t?i \| 1740 ni-t?i \| 1750 ni-t?i
ni :	1716 ni \| 1717 ni \| 1718 ni \| 1719 ni \| 1720 ni \| 1721 ni \| 1722 ni \| 1723 ni \| 1724 ni \| 1725 ni \| 1726 ni

**1721 ni t? ki-thaⁿ le?k-hoat**
Kan-chi	Keng-chu ni ? kau ? Sin-thiu ni
Gregorius le?k	1721 ni MDCCXXI
Julius le?k	pi Gregorius le?k cha 11 kang
Hu?t-le?k	2265 ni
T?-kau-le?k	4418 ni
Hoe-le?k	1133~1134
Hong-ki	2381 ni
Tan-ki	4054 ni
Hi-pek-lai-le?k	5481~5482
Se-ch?ng-le?k	iong thih chhi (lcags pho byi) ? kau ? im thih gu (lcags mo glang)
Hindu le?k
- Vikram Samvat	1776 – 1777
- Shaka Samvat	1643 – 1644
Iran le?k	1099 – 1100
Runic le?k	1971
Assyria le?k	6471 ni
Ethiopia le?k	1715~1716

1721 ni t? Gregorius Le?k-hoat l?i-b?n s? chi?t e peng-ni , thau kang s? si-kan chho-g?? ; t? Julius Le?k-hoat l?i-b?n s? chi?t e peng-ni , thau kang s? le-pai-ji?t . Chia ni t? Gregorius Le?k-hoat l?i-b?n pi Julius Le?k-hoat cha 11 kang. P??-h?n kok-ka t? 1923 ni i-cheng iau ?ng Julius Le?k-hoat.

Lian-h? [ siu-kai | kai goan-si-be ]

T?i-chheng-kok : Seng-cho? (聖祖) 60 ni
Tiau-sian-kok : Keng-chong (景宗) goan ni
T?i-oa?t-kok ( Oa?t-lam ):
- Pak-hng ( Le Tiau Tiong-heng ): J?-chong (裕宗) 17 ni
- Lam-hng ( Nguy?n Chu ): Chua Minh (主明, "Beng-chu") 30 ni
Liu-kiu-kok : Si?ng Keng Ong (?敬王) 9 ni

3 goe?h 19 ji?t : Kau-hong Clemens 11-se , seng-chhit-chia. Kau-hong. 1649 ni chhut-si.
5 goe?h 18 ji?t : Dawit 3-se . Ethiopia Hong-te. 1695 ni chhut-si.