All dates are quoted in Galactic Era (GE) and Foundation Era (FE) which starts in 12,066 GE.
| Date |
Event |
| GE |
FE |
| 11,988 |
-78 |
Hari Seldon and Cleon I are born on Helicon and Trantor, respectively. |
| 12,010 |
-56 |
Cleon I is crowned Emperor after the death of his father, Stanel VI. |
| 12,020 |
-46 |
Hari Seldon arrives on Trantor to deliver his paper outlining his theory of psychohistory, a method of predicting the future along mass social change in humanity. (Events of Prelude to Foundation) |
| 12,028 |
-38 |
(Events of "Eto Demerzel" in Forward the Foundation) |
| 12,038 |
-28 |
Death of Emperor Cleon I. (Events of "Cleon I" in Forward the Foundation) |
| 12,048 |
-18 |
Dors Venabili dies. (Events of "Dors Venabili" in Forward the Foundation) |
| 12,058 |
-8 |
(Events of "Wanda Seldon" in Forward the Foundation) |
| 12,067 |
-1 |
Hari Seldon goes on trial by the Commission of Public Safety and the Encyclopedia Galactica Foundation is exiled/established on Terminus. (Events of "The Psychohistorians" in Foundation) |
| 12,069 |
1 |
Hari Seldon dies. (This date is explicitly mentioned in "The Psychohistorians" in Foundation) |
| 12,116 |
50 |
(Events of "The Encyclopedists" in Foundation) |
| 12,146 |
80 |
(Events of "The Mayors" in Foundation) |
| 12,146-221 |
80-155 |
(Events of "The Traders" in Foundation) |
| 12,221-61 |
155-195 |
(Events of "The Merchant Princes" in Foundation) |
| ~12,261 |
~195 |
General Bel Riose embarks on his quest to claim the Foundation in the name of the Empire and the Emperor, Cleon II. (Events of "The General" in Foundation and Empire) |
| 12,376 |
310 |
(Events of "The Mule" in Foundation and Empire) |
| ~12,381 |
~315 |
(Events of "Search by the Mule" in Second Foundation) |
| ~12,386 |
~320 |
Death of the Mule. |
| 12,428 |
362 |
Arkady Darell born Second Foundation |
| 12,442-3 |
376-377 |
(Events of "Search by the Foundation" in Second Foundation) |
| 12,443 |
377 |
Battle of Quoriston between Lord Stettin and the Foundation |
| 12,564 |
498 |
Golan Trevize chooses the Gaia overmind and Galaxia in preference to a Second Empire founded militarily by the First Foundation and ruled by the Second Foundation. (Events of Foundation's Edge) |
| 12,565 |
499 |
Golan Trevize searches for Earth with the hopes that his finding will validate his choosing of Galaxia. (Events of Foundation and Earth) |
| 13,066 |
1000 |
Creation of Second Galactic Empire (presumed) |
| 13,086 |
1020 |
116th Edition of the Encyclopedia Galactica published. |
