From A Wiki of Ice and Fire
The Bullocks served House Targaryen. Ser Merrell Bullock was a knight who was the commander of the castle garrison at Dragonstone during the reign of King Jaehaerys I Targaryen. He had two sons, Ser Alyn and Ser Howard.
House Bullock at the end of the third century
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- Ser Merrell Bullock, commander of the garrison of Dragonstone, dismissed by Rhaena Targaryen for failing to prevent the theft of dragon eggs by Elissa Farman.