File:Ivalice-time.jpg

The timeline of Ivalice in Final Fantasy Tactics and Final Fantasy XII, provided by Square Enix's official guide book, Final Fantasy XII Ultimania Omega. Translation is as follows:

Final Fantasy XII History (brown)
 * 1st Upper Box: Unknown Era - The Occuria reside in Giruvegan.
 * 2nd Upper Box: Old Valendia 1 - Establishment of the Galtean Federation.
 * 3rd Upper Box: Old Valendia 394 - The Galtean Federation breaks apart.
 * 4th Upper Box: Old Valendia 706 - Final Fantasy XII takes place.
 * 5th Upper Box: Several decades after Old Valendia 706 - Female St Ajora establishes a new religion.

Grey box: Possibility of them being the same person? Final Fantasy Tactics History (blue)
 * 1st Lower Box: Unknown Era - 12 Knights kills a demon, and rescues Ivalice.
 * 2nd Lower Box: 1200 years before the Middle Ages - St Ajora establishes the Glabados religion.
 * 3rd Lower Box: Unknown Era - A catastrophe befalls the civilization at this age.
 * 4th Lower Box: Middle Ages - Final Fantasy Tactics takes place.