Vagrant Story is still up in the air to be honest. I don't believe it was counted in the timeline given in the FFXII Ultimania but if you play through the game, there were several references to FFT that fans felt placed the game after FFT. Throw in the fact that Valendia debuted in VS (for those who don't know, its the region that Archades is located in XII) and its got a strong case for itself. Most fans feel the game probably takes place a few centuries after the death of Alazlam J. Durai, (the narrator of FFT) since VS generally refers to him in the past tense.

As far as I know, VS is still up in the air as far as continuity, and TA has pretty much been confirmed to be non-canon.