[3] Its built-up area is continuous with those of the neighbouring suburbs Kalogreza, Nea Ionia, Metamorfosi, Lykovrysi, Pefki and Marousi.

Irakleio was refounded as a military colony for the Bavarian Auxiliary Corps by King Otto.

During World War II, Heinrich Himmler, who learned of the German origin of many Irakleiotes, came in person to the area and took measures to ensure their comfort amidst the Great Famine.

About a hundred Irakleiotes were even persuaded to move to Germany as Volksdeutsche and join the German war effort, but once in Bavaria they found a hostile welcome; and when they returned home in 1945, they found their properties confiscated by the Greek government.

Princess Alice of Battenberg (1885-1969), founded the Orthodox religious order of Martha and Mary here after World War II.