Moris
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No. "Following the Markarth Incident, Ulfric was arrested. His father, The Bear of Eastmarch, died while Ulfric was imprisoned, and Ulfric was forced to deliver his eulogy via a letter that he had smuggled out of prison" He was arrested so the dragging people wouldn't of happened yet, not until later on. Torygg wasn't High King yet. The dragging people would of happened just before the rebellion, to spark it off.
I'm just looking for some thing that tells me when the Thalmor started to arrest Skyrim citizens for worshipping Talos.
You said, "later on". I want a source that tells me when.
Did the Thalmor not arrest any Talos worshippers until after Torygg's death? If not, what basis do you have for believing that? I just want to nail it down.