The feudal politics of the Dance gets very confusing in the Reach, where it does seem quite a bit like GRRM kind of picks houses at random, out of a need to ensure that the Hightower army doesn’t bulldoze its way to King’s Landing.
My No Prize theory is that the Hightower’s focus on royal politics in the reigns of Jaehaerys I, Viserys II, and Aegon II led them to neglect their home turf, leading to their vassals feeling disgruntled.
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