During 1059 – 1069 Huns of Serbian origin invaded Oreini Naupaktia . Such people also settled in Elatou, where they worked as sheperds. The name «Eletsou» or «Eletzou» was given to the village by the Slavs and it means «sunny». Many other locations around the village also have Slavic origin. Even when many of the Slavs left, the names remained.

During the Venetian rule, Oreini Naupaktia was subjected to them, but because it was difficult to access the specific area and because the villagers were insubordinate it was never occupied by the military. In 1499 Aitolia was occupied by the Turks. From 1687 till 1699 fell under the rule of Venetians again, and for this period Oreini Naupaktia was considered almost free, as Venetians did not bother the inhabitants. After 1699 with the Karlovitz treaty the wide area – where Eletsou belonged – was given to the Turks.

In 1820 the village was burned by Turkish-Albans who came to Oreini Naupaktia after being chased out of Naupaktos. At that time there were 20 families in the village, who found shelter in a cave outside the village named «Arkoudotripes» (Bear holes). After the burning 17 families remained in the village and decided to rebuild it in its present location, since the ground of the area is more solid from that of «Palioxoria» (the old location of the village).

In 1828 Oreini Naupaktia was set free from the Turks.

In 1833 Eletsou became part of Municipality of Apodotia in the province of Naupaktos. Since almost all the area villages had Slavic names from the time the Slavs had settled there, all the villages were renamed (from 1921 till 1928) and Eletsou was given the name Elatou, due to its fir tree forests(since «elato» means fir).

Today Elatou belongs to Municipality of Apodotia with Ano-Hora its base

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