dönemden
Dönemden is the ablative form of the Turkish noun dön em, meaning “from the period” or “from the era.” In Turkish grammar, the ablative case signals origin, source, or movement away from something, and is formed by adding -den or -dan to a noun. The form dön emden is therefore used to indicate that something originates in or is taken from a particular period, or to specify a starting point in time.
The usage of dön emden is common in historical, archival, and scholarly writing, where authors situate events,
Dönemden should be distinguished from döneminde, which uses the locative case to indicate containment or occurrence
See also: Turkish grammar, ablative case, postpositional phrases, periodization, historical writing in Turkish.