Suffering this from the Aeginetans, the Athenians no longer put off devising all mischief against Aegina. There was a notable man in Aegina, Nicodromus son of Cnoethus by name, who held a grudge against the Aeginetans for his former banishment from the island. When he learned that the Athenians were now set upon harming the Aeginetans, he agreed to betray Aegina to the Athenians, naming the day when he would make the attempt and when they must come to aid him.