The Conference of Poros had opened in…
December 1828 CE
The ambassadors of Britain, Russia, and France meet on the island of Poros on December 21, 1828, and prepare a protocol, which provides for the creation of an autonomous state ruled by a monarch, whose authority should be confirmed by a firman of the Sultan.
The proposed borderline runs from Arta to Volos, and, despite Kapodistrias' efforts, the new state will include only the islands of the Cyclades, the Sporades, Samos, and maybe Crete.