It would be nice if you had an area in the tomb with open coffins for Uriel, and his Three assasinated sons (decorated with Imperial Lilys, presents, jewels, etc), so that the people of the Imperial City could pay their respects.
Throw a small figurine of Sanguine and a bottle of Cyrodiilic Brandy in the corner to represent his brief stay on the Imperial Throne.
He was a guest in the Imperial Palace, bound to the confines of the White Gold Tower, during the reign of a Reman, he wasn't in power, and attaining power isn't part of his sphere. His debauchery was enough to set the Imperial City ablaze with partys beyond compare, but his lust was not for the throne, and nor did he attain it.