Part of the story arc:
Tarbh Uisge was captured while still a calf by an ambitious mummer and trained to entertain audiences around Eorzea.
Looks like we may have a glimpse of what might be the name of the BST master class. I wiki'd Mummer and its defined as:
Mummers and "guisers" (performers in disguise) can be traced back at least to the Middle Ages, though when the term "mummer" appears in medieval manuscripts it is rarely clear what sort of performance was involved. A key element was visiting people in disguise at Christmas. http://en.wikipedia.org/wiki/Mummer
on a side note. These, leve/faction quests, would have so much immersion if they added an audio recording for the text, whenever you opened your journal to check it, and/or before you accepted it. A narration of sorts.