I added Antonio de Leyva's Ciphers from 1525 and 1527 in
"Ciphers during the Reign of Emperor Charles V" and
"Tracing the Origin of Vowel Indicators in Spanish Ciphers".
Leyva's Cipher (1527) is the earliest cipher with vowel indicators known to me.
I was looking for a specimen using Leyva's cipher used with Lope de Soria from about 1528-1535, but instead stumbled on this earlier example.
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