User blog comment:IceFireWarden0/Next Official Elder Scroll's Game Predictions/@comment-4113369-20121128154845/@comment-16219425-20121128185256

@Ralok

Relatively little is known about the Hist. They are first mentioned in 2E 864, in the Pocket Guide to the Empire, First Edition, where it is written that Argonians are rarely seen outside of their homeland, except for a relatively intelligent strain called the Hist. [1] The guide further adds that they are "repulsive, but peaceful enough to be tolerated among the human kingdoms, and can be found as far as western Hammerfell".[1] The book, The Annotated Anuad suggests that the Hist are the "Trees of Argonia" [2] (today known as the Black Marsh). They are believed to have been around since the time of the creation of Nirn,[2] and this has since been confirmed by such sources as the Third Edition of the Pocket Guide to the Empire, where it is confirmed that they, rather than the Aldmer or the Nedics, were likely the original forms of life on Tamriel.[3] The Hist are possibly a race of reptilian plant life that evolved into two reptilian races, the Tsasesci and Argonians, though this is speculation.

It is further mentioned later on when it states: ''Rumors and speculation also abound regarding the Hist, a species of giant spore tree growing in the innermost swamps of Argonia. Some have maintained that natives worship the trees; others claim the trees are, in fact, a sentient race, more ancient than all the races of man and mer. No reliable accounts of expeditions into central Argonia exist to lend credence to these claims, and modern Argonians are reticent to speak of the mysterious trees'' [4]   - Hist Article