1278: Jier
| Iuwen: | 8e | 9e | 10e | 11e | 12e | 13e iuw | 14e | 15e | 16e | 17e | 18e |
| Jierren: | 1273 | 1274 | 1275 | 1276 | 1277 | 1278 | 1279 | 1280 | 1281 | 1282 | 1283 |
 Kalinders | |
| Gregoriaanske kalinder | 1278 MCCLXXVIII |
| Ab urbe condita | 2031 |
| Armeenske kalinder | 727 ԹՎ ՉԻԷ |
| Etiopyske kalinder | 1270 – 1271 |
| Hebriuwske kalinder | 5038 – 5039 |
| Hindoekalinders | |
| - Vikram Samvat | 1333 – 1334 |
| - Shaka Samvat | 1200 – 1201 |
| - Kali Yuga | 4379 – 4380 |
| Iraanske kalinder | 656 – 657 |
| Islamityske kalinder | 677 – 677 |
Juliaanske kalinder | 1278 MCCLXXVIII |
| Sineeske kalinder | 3974 – 3975 甲丑 – 乙寅 |
1278 is in gewoan jier dat begjint mei in sneon. (Juliaanske kalinder foar 1278.)
Foarfallen
Berne
- datum ûnbekend
- Kristoffel fan Seton, Skotsk ridder en frijheidsstrider († 1306)
Ferstoarn
- 26 augustus - kening Ottokar II fan Bohemen (* 1232)
| Jierren: | 1273 | 1274 | 1275 | 1276 | 1277 | 1278 | 1279 | 1280 | 1281 | 1282 | 1283 |
| Iuwen: | 8e | 9e | 10e | 11e | 12e | 13e iuw | 14e | 15e | 16e | 17e | 18e |
| Boarnen, noaten en/as referinsjes: | ||
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