The conversation between human and AI assistant.
[|Human|] When Aegon the Conqueror took over Westeros, which great house of the Reach became extinct as a result?
[|AI|] House Gardener became extinct during Aegon's Conquest. House Tyrell was then granted rule of The Reach.
[|Human|] 
When Aegon the Conqueror took over Westeros, which great house of the Reach became extinct as a result?