Kandalon
From Multiversal Omnipedia
Kandalon was a pioneering chronomancer who lived on a Prime Material Plane world during its Mentirn Dynasty. However, a year after making his findings publicly known, his civilization collapsed.
He wrote several works- Theories on Time, The First Journal of Kandalon, The Second Journal of Kandalon, and The Travels of Kandalon Volumes I & II. The Oration of Kandalon, his first public speech on the topic of "temporal magic," was also published.
Comments
Whether or not the collapse of the Mentirn Dynasty is connected to the experiments of Kandalon or his colleagues in chronomancy is uncertain, but it's implied.