In this guide, you will get to know how to get the Medieval Furniture in Roblox Islands Medieval update.
You will need to head over to Asiles to get a furniture workbench. In the options, you have to scroll down to the bottom, and you will find different furniture like castle shields, medieval chandeliers, etc. You have to craft the castle shield, then you can hang it on the wall, and it looks like a banner, as shown in the image below.
These items will cost you different amounts of money, and you can check the cost in workbench options.