Forgotten Ruins are ruins located near mountains, its a place that appears in the first game of the series.
Wild Arms[]
The abandoned place has no more than a few old books and lost Ocarina item.
This item has the power to summon the golem of the Asgard land in the place where the person who is in possession of it plays its music.
In books you can find some information with no specific date:
"Deep inside a heavily sealed ruin.. I found small life trying to hibernate, i don't know how important this will be for my studies of ancient remains but i will take this little life to the outside world, and dedicate this short life of mine to it"
"the forbidden life that stepped into the realm of the gods. This is a result of the legendary battle with the demons.Distoring people's mind making fool of their lifes the realm of the gods, we should have not tread ... this little life is from the time of legends, this little ilfe use the forbidden powers as if it were a toy."
"This man-made child grew up among us, surprising this child knows what pain is although. he was built as a weapon. If it can learn pain, then it can learn compassion. I find myself communicating with this man-made child as if I am his parent, yes this child is more human-life than anybody else I know. From this day foward, this will be my grandchild. His name wil be..."