1400: Bliain
| Blianta: 1397 1398 1399 - 1400 (MCD) - 1401 1402 1403 | |
| Deicheanna blianta: 1370í 1380í 1390í - 1400í - 1410í 1420í 1430í | |
| Céadta blianta: 14ú céad - 15ú céad - 16ú céad | |
Eachtraí
Breitheanna
- 25 Mí na Nollag - John Sutton, Fear Ionaid Rí Shasana in Éirinn
- timpeall na bliana seo – Guillaume Dufay, cumadóir ceoil Francach (b. 1474)
- sa bhliain seo nó roimhe – Fra Angelico, ealaíontóir Iodálach (b. 1455)
Básanna
- 14 Feabhra — Risteard II Shasana
- 7 Bealtaine — Baldus de Ubaldis, dlí-eolaí agus scríbhneoir Iodálach
- 25 Deireadh Fómhair — Geoffrey Chaucer, file Sasanach (r. 1343)
- dáta anaithnid - Narayana Pandit, matamaiticeoir Indiach
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