![John de Lacy](images/royal/john-de-lacy.png)
![Melvil Dewey](images/inventors/melvil-dewey.png)
Family Relationship of
John de Lacy
Magna Carta Surety
19th Great-grandfather to
Melvil Dewey
Inventor of the Dewey Decimal System
★ → Click or tap a name to see more details including source citations.
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Dewey Decimal System
Magna Carta Surety
Inventor of the Dewey Decimal System
★ → Click or tap a name to see more details including source citations.
Dewey Decimal System