I think that image is upside down -- the central motif is a tughra of an Ottoman sultan, the formal seal/signature. There are lists of those online if you want to make a visual comparison and work out which one it is, which might help date it. That is gold thread, and that kind of raised embroidery is called couching, and is a common technique in a lot of Ottoman and European textiles. The four elements in the corners contain script, which is probably Ottoman Turkish. Beyond that, I don't know--it's an imperial Ottoman textile, I'd guess 19th century, 18th not impossible. It's certainly interesting, more so since it has some provenance -- you can say where it was stored for a long time! A museum with Ottoman textile collections might be able to tell you more. Meanwhile, keep it in a cool dark dry place, and store it with some mothballs wrapped in tissue paper so they don't contact it directly. Light and moisture will destroy it, not to mention bugs.