Looking through the fantastically-titled Libro di M. Giovambattista Palatino cittadino romano : nelqual s'insegna à scriuer ogni sorte lettera, antica & moderna, di qualun que natione, con le sue regole, & misure, & essempi : et con vn breve et vtil discorso de le cifre by Palatino, I notice that double-page G (PDF-page 100) contains a spread of the Latin Alphabet ("ALPHABETVM LATINORVM"). There is something decidedly odd about the letter choice however — note that the bottom line contains two almost-identical "Y" forms.
Is there a historical reason for this? Were the letters pronounced differently?
Similarly, double-page Eiiii (PDF-page 75) of the same book contains a double-page spread of the Roman letters ("LETTERE ROMANE"). This also shows the two different forms of letter "Y".


