I'm not sure if this has been cited, but here's Epicurus's entry in the the Suda:
https://www.cs.uky.edu/~raphael/sol/sol-entries/epsilon/2404
The most pertinent section for the purposes of the timeline include:
His school continued until the first Caesar, for 227 years. In these [years] there were 14 successors.
Now, we now the Epicurean school lasted longer than "the first Caesar" because Popillius Theotimus was in charge of the Garden in 121 CE when Trajan was emperor.
But it appears the Suda is saying there were 14 "successors" to Epicurus between Epicurus's death and "the first Caesar." It looks like we still have the names of 10 of them.
The Suda was composed/compiled in the 900s CE.
Of interest, too, in the online Suda is : Translated by: Marcelo Boeri on 22 October 2003@15:29:13.