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Sigillography
the study of seals attached to documents as a source of historical information / From Wikipedia, the free encyclopedia
Sigillography is the study of the seals used on documents.[1] It is one of the auxiliary sciences of history. It has links to diplomatics, heraldry, social history, and the history of art.
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This field of study was started in the 15th century by students of old artifacts. Then it became more well known in the 16th and 17th centuries.[2][3] At first this field of study was thought of as part of diplomatics. But over time it became known as its own field of study.