The word "Letters" is a synonym therefore it has two meanings. Which definition of the word "Letters" did you mean so it will give me a clear view of what answer you want.
Clarification needed. "Letters" could refer to
The characters we write with--the ABC's Correspondence: messages we write and mail to people Literature--the literary arts (as in "a man of...
This was the main form of communication between people, either near or far away. In case of emergency (if the sender could afford it), he could send a private messenger on horseback or by coach.
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