Philosopher and social reformist Jeremy Bentham, who died in 1832, bequeathed a set of a rings containing his bust in silhouette and strands of hair to 26 individuals.
The Bentham Project, the centre behind the project, has managed to track down six of the mourning rings but is looking for the missing 20. The rings are significant as it highlights how attitudes to death have changed over time.
The Bentham Project is part of the UCL Faculty of Laws, and aims to produce a new scholarly edition of the works and correspondence of Jeremy Bentham.
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