“who is also the voice of Prince Valanar in Mists of Pandaria”
Unless Prince Valanar recovered from being dead after we beat him up in WotLK and decided to take time off from his heavy Scourge workload by taking a vacation in Pandaria, he was never in Mists of Pandaria to my knowledge, nor were any San’layn present on Pandaria to the best of my knowledge.
He did, however, play a pretty big role in WotLK in several questlines:
And while I’m at it, if you want more info on the San’layn in general, check out our work and support here in the San’layn megathread:
Thank you! 
—22 days until Blizzcon starts (Nov. 3rd)!—
