Fortified Manor is a location in Elden Ring.
It is the former Roundtable Hold in Leyndell, Royal Capital and stands empty, except for a few servant enemies.
The "Flightless Bird" Painting is here next to the grace of the same name, as well as the Coded Sword, Hammer, and a lot of other items.
Note that you can not visit the Fortified Manor anymore after defeating Maliketh.