I just got the Dust of Restful Death back from Medora Direnni at Direnni Tower and now I have to take it to Lysandus's Tomb and sprinkle it on his corpse. So after some time trying to figure out where Lysandus's Tomb is on my own, I give up and check the UESP. Much to my dismay, UESP says that to reveal the location of Lysandus's Tomb, I had to do the Stronghold of the Blades quest, which before that I had to do the Wayrest Painting quest, which I chose to skip because I didn't want to be an ally to Sentinel. Now the time frame to accept the Wayrest Painting quest from Queen Akorithi has long passed, and I have no save games I can load from before. I've traveled to Sentinel and have tried talking to the Queen but get no response.

Edit: Forgot to mention, I saw on UESP that Lysandus's Tomb is located in Menevia, so I clicked Menevia on my map and searched for Lysandus's Tomb but it didn't find it.