A naval administrator, best remembered for his diary (1660-1669).

"Though he had no maritime experience, Pepys rose to be the Chief
Secretary to the Admiralty under both King Charles II and King James II
through patronage, diligence, and his talent for administration."

https://en.wikipedia.org/wiki/Samuel_Pepys

I had the impression his diary was written in a cipher, but it was
actually a form of shorthand called tachygraphy, invented by Thomas Shelton:

https://en.wikipedia.org/wiki/Thomas_Shelton_(stenographer)

The diary covers both his work and public life, and London life of that
period, including the years of the Great Plague and the Great Fire, but
also his domestic and personal affairs. In recounting his sexual
adventures, he employs what Crystal calls "multilingual code-switching":

"she was to my thinking at this time une de plus pretty mohers that ever
I did voir in my vida, and Godforgive me my mind did run sobre elle all
the vestpre and night and la day suivants".

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