Ancient da Vinci?

καὶ τὴν μνημονικὴν δὲ τέχνην εὗρεν οὗτος· προσεξεῦρε δὲ καὶ τὰ μακρὰ τῶν στοιχείων καὶ διπλᾶ καὶ τῇ λύρᾳ τὸν τρίτον φθόγγον

According to the Suda, Simonides invented mnemonics, long vowels, double consonants, and the third note on the lyre.