Pateneit is the name of the Egyptian priest that Solon spoke to in Sais, according to Proclus (5th cent. AD) in his Commentary on Plato’s Timaeus (Vol I). He adds that he also spoke to two other priests, Ochlapi at Heliopolis and Ethimon at Sebbynetus. However, Plutarch (2nd cent. AD) gives the names of the priests at Sais and Heliopolis as Sonchis and Psenophis respectively. It is frustrating that we no longer have access to the sources used by Plutarch and Proclus, but they do seem to enhance the provenance of Plato’s account.
The Thomas Taylor translation of Proclus’ commentary can be read online(a)(b).