This paper opens with a short survey of the sources on the merging of
Argos and Corinth and on its chronology; then, it focuses on the charge
of betrayal brought against the pro-Spartan element in Corinth.
According to Xenophon and Demosthenes, the Corinthian oligarchs
had already intended to betray the alliance after August 394. This charge
is supposed to have caused the massacre of the pro-Spartan
Corinthians in the Eukleia. The paper also highlights Athenian interest in Corinthian loyalty to the alliance: Athenian and Argive troops stayed
together in Corinth until the Athenian general Iphicrates was removed
from Corinth and the Argives were able to seize the Corinthian citadel.
As for the precise form of the Argos-Corinth Union, two aspects must
be considered: 1) the Union was organized in wartime; 2) there were
pro-Athenian and pro-Argive democrats in Corinth. In this context, we
must rule out both synoikismos and sympoliteia and assume a form of isopoliteia
(which may explain the Argive involvement in the Isthmian
Games in 392).