Many of the ECF believed in Chiliasm which is Millennialism, at the very least a belief in the existence of a one thousand year period of Jesus reigning on the earth.
You have probably read of some of the heretical beliefs of Origen before.
Let me remind you of some of them.
He was the first one to develop the mode of allegorizing the Scripture. Augustine popularized it.
He was called by many "the Father of Arianism."
He was a universalist.
Here is Origen's beliefs concerning eschatology:
http://christianityinhistory.blogspot.ca/2008/04/amillennialism-of-origen-ad-230.html
It is very possible that he was the first ammillenialist and the first Preterist.
Those are not and were not popularly held beliefs in the early centuries.
But Origen was a heretic. Much of what he believed was heresy.
He was so out in left field that even
the RCC excommunicated him.
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