In terms of mysteries in A Song of Ice and Fire, there are major ones that exist (e.g. Jon’s parentage, the true identity of Aegon VI, who wrote the Pink Letter etc), middling mysteries (e.g. Who is the Hooded Man in Winterfell?) and minor ones (What happened to Weasel?) However, there are a handful of mysteries that belie categorization. One of the more interesting ones is how Stannis Baratheon discovered the parentage of Cersei’s children. It seems like a question with a relatively straightforward answer. He figured it out on his own.
But did he actually figure this out on his own? Or did he come across this information in a different way? In part 1 of the Agents of Chaos series, we puzzled out the identity of Taena Merryweather as an agent of Varys’. In part 2, we shift our focus from Varys to Littlefinger, but our focus will be on his methods of spreading chaos, and I’ll make a plausible case that Littlefinger was responsible for Stannis discovering the parentage of Cersei’s children with a bonus section of who Littlefinger’s unwitting agents might possibly be.