I don't mean to sound like I'm being a jackass or anything, but you know, the easiest and fastest way to find out would be to not be completely lazy and just go talk to the magian moogle and click sword trials. he'll tell you everything you need to know about all of them. The Excalibur trials will be in the higher numbers probably second from the bottom of the initial list. It takes like 5 mins at the most and I dunno why you would have bothered posting about it to wait hours possibly days for a response when the moogle is sitting right there in jeuno for you.
90DRG 90DNC 90PLD 90COR 90RNG 90THF 90BST 81NIN
<Insert random accomplishments and/or merits that no one else cares about here>
In my day vampires sucked blood... not ****.
Friends don't let friends watch American Idol.
I killed Asmodean, let the speculation end.