Xenophon's Hellenica opens where Thucydides' unfinished History of the Peloponnesian War breaks off in 411 BC, as its continuation.
Nonfiction· -400· Historical
by Θουκυδίδης Thucydides
Ἱστορίαι (History of the Peloponnesian War): 1 recorded work traces back to it.
Works that record this one as a source, with the evidence a contributor gave.