Approximately 1000 years ago
- Using the power of these fayth, Yevon summons Dream Zanarkand - the memory of Zanarkand. He himself becomes Yu Yevon, and creates the first Sin. (The birth of Sin.)
- Yunalesca, a summoner from Zanarkand, turns her husband Zaon into a fayth and destroys Sin with the Final Summoning. She remains on Spira as an Unsent
- The second Sin appears publicly with Yunalesca's Final Aeon (Zaon) as its core. It destroys the remaining machina civilisations.
600 years pass... With Sin killing thousands every year ?
Approximately 400 years ago
- Summoner Gandof defeats Sin with his Final Summoning and becomes the first high summoner in history.
(This gives credence to Yevon's teachings, and doubts about the Temples subside.)
GANDOF'S CALM
- The third Sin appears publicly, with Gandof's Final Aeon as its core.
170 years of Sin Killing ?!?!?
Approximately 230 years ago
- Summoner Ohalland, a former blitzball player, defeats Sin with his Final Summoning and becomes a high summoner.
OHALLAND'S CALM
- The fourth Sin appears publicly, with Ohalland's Final Aeon as its core.
130 years of Sin Killing ?!?!?
Approximately 100 years ago
- Summoner Yocun, a former Crusader, defeats Sin with her Final Summoning and becomes a high summoner.
YOCUN'S CALM
- The fifth Sin appears publicly, with Yocun's Final Aeon as its core.
90 years of Sin Killing ?!?!?
10 years ago
- Summoner Braska defeats Sin using Jecht as the fayth for his Final Summoning, and becomes a high summoner.
BRASKA'S CALM
9 years ago
- The sixth Sin appears publicly, with Braska's Final Aeon (Jecht) as its core.
1 year ago
Sin reappears and kills Chappu
http://forums.eyesonff.com/showthread.php?p=1496935