The first "Cyclopean walls" were built in 1350 B.C.E and they were extended one hundred years later, when the "Lion's Gate'' and the "North Gate" were constructed. The walls' height was 12 m. and they extended to 900 m. On its exterior side, the rocks were big and unprocessed; while the interior side had smaller sized ones. The rocks' shapes were uneven, which allowed the construction to survive under strong earthquakes thanks to the friction which was created. According to the myth, Perseus, the founder of Mycenae ordered the Cyclops to construct the walls, and this is why they are called cyclopean until today.