Concept
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Created by Boundless
The English Protectorate
Cromwell's signature
Cromwell's signature before becoming Lord Protector in 1653, and afterwards. 'Oliver P,' standing for Oliver Protector, similar in style to English monarchs who signed their names as, for example, 'Elizabeth R' standing for Elizabeth Regina.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"800px-Cromwell_signature.jpg."
https://en.wikipedia.org/wiki/Oliver_Cromwell#/media/File:Cromwell_signature.jpg
Wikipedia
Public domain.