Ring guess:
Belonged to the Sea Captain we got a casting calling for. Liam took the ring off the Captain after he and Hook overthrew the Captain who was not a good captain (very “Bounty”). Liam gave Hook the ring at some point as a symbol that Hook would be captain someday. At some point the Brothers learned that the ring was enchanted by a (surprise!) Hades to keep the wearer alive.
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"He was a lot of things to me" "The only conclusion was love"