Il _Lexicon quod Theaeteti vocatur_ e il codice Palatino greco 173 di Platone

In this paper, I have been able to demonstrate that the so-called Lexicon Theeteti is an apographon of Pal. gr. 173, a well known Plato's manuscript of Xth century. The codex Laurentianus 57,24, which contains the lexicon, previously dated to XIV/XV century, was also backdated to the first half of XIVth century.