Signet-ring of the Black Prince (1330–1376).
- Author: Louvre Museum, Public domain, via Wikimedia Commons
- Original file: https://upload.wikimedia.org/wikipedia/commons/a/a6/Signet-ring_Black_Prince_Louvre_OA9597.jpg
- Modifications: none
- License: Creative Commons Attribution-Share Alike 4.0 International license.