Is there any information at all on what Jeromno stumbled upon, or any informations on Lady's Jesters of the past? Just wondering.
Planescape, Dungeons & Dragons, their logos, Wizards of the Coast, and the Wizards of the Coast logo are ©2008, Wizards of the Coast, a subsidiary of Hasbro Inc. and used with permission.
None really.
And it's not known if his title is self-given based on the palace name, or if there have been previous people by the same title. The Palace of the Jester is perhaps the oldest building in Sigil, as it happens to be mentioned in the text referring to Darkwood's time in the dim past as that nameless 'ancient wizard'. The Palace is also noted as being the residence of a sage, seer, or diviner (whose name escapes me), though it's not clear if this has any link to the current name of the Palace, or its origin.
I've worked with the ancient history of the Palace somewhat in my storyhour, but that's just my own take rather than being based on canon stuff. I went off on a tangent from the mentions in 'In the Cage' regarding how the Dabus seemed spooked at times in the Palace, looking over their shoulders, etc and that Jeremo had a MASSIVE problem with Cranium rats rumored to exist.