I updated the article "Ciphers during the Reign of Emperor Charles V" by adding a section of a cipher used by Genoese Admiral Andrea Doria in writing to Emperor Charles V.
This is the oldest vowel indicator system that I know. (Hence, I also updated "Tracing the Origin of Vowel Indicators in Spanish Ciphers" by mentioning the Doria-Charles V Cipher (1528).)
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