Tristram of Diablo series

Jered Cain (ancestor of Deckard cain) and other horadim members sealed diablo under the monestary.
In diablo2, tristram was distroyed by aidan (the son of leoric, also warrior of Diablo 1) after he corrupted by diablo's soulstone.
In diablo3, there is new town called 'New tristram', it is not old tristram.
Now, old tristram degenerated by fanatics.
If you access diablo3 with 1 level character, you can hear tristram BGM until alive New tristram.