1420s ke ngwagasome tšhupamabakeng ya Gregorian wa go thoma ka 1 Pherekgong 1420 ya fela ka 31 Manthole 1429. Ngwagasome 1420s o wela ngwagengkgolo wa 15.
| Ngwagakete: | Ngwagakete2 |
| Mengwagakgolo: | Ngwagakgolo 14 – Ngwagakgolo 15 – Ngwagakgolo 16 |
| Mengwagasome: | 1390s 1400s 1410s – 1420s – 1430s 1440s 1450s |
| Mengwaga: | 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 |
| 1420s-tšago tswalanya: |