I just finished Brandon Sanderson's novella The Emperor's Soul and have been trying to place its setting in relation to Elantris. In terms of location, we can figure out that it's set in the northwest of Opelon as the story talks about the Teod peninsula in the south.
However, I'm having trouble figuring out when the story is set in relation to the events in Elantris. There are references to the regions of JinDo, Svorden and Teod, so at least these nations seem to exist at the time. There is also mention of a "southern red priest" which I assume is a reference to the Shu-Dereth religion from Elantris. So at least it can't take place more than a few hundred years before Elantris because the religion wasn't that old.
One thing I've noted is that the map of Sycla/Opelon that was contained in Elantris denotes the region northwest of Teod as "Rose Barbarians?". However, what we see in The Emperor's Soul is far from a Barbarian nation (and calls itself the "Rose Empire"). The map itself does acknowledge:
This map has severe deficiencies especially in the northwest, [...]
But this could also refer to the geography. If the Rose Barbarians were really barbarians at the time that have "evolved" into the Rose Empire by the time of The Emperor's Soul at least (on the order of) a thousand years must have passed, because Ashravan is the 49th emperor. Then again, this map is from Fjorden, and I wouldn't put it past them to call any nation barbaric that doesn't believe in Jaddeth.
So... did I miss any clues that can give a definite answer to when The Emperor's Soul is set? Or did Sanderson ever address this outside of the text?