What seven houses ruled the Seven Kingdoms before Aegon's Conquest?
Stark, Tully, Arryn, Lannister, Tyrell, Baratheon, and Martell
Instruction: What seven houses ruled the Seven Kingdoms before Aegon's Conquest?
Context: 
Response: Stark, Tully, Arryn, Lannister, Tyrell, Baratheon, and Martell