From A Wiki of Ice and Fire
House Bullock is a house who served House Targaryen during the reign of Jaehaerys I Targaryen. The houses words and sigil are not known, nor is their seat.
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
- no member has appeared yet.
- 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. 
- Ser Alyn Bullock, his eldest son.
- Ser Howard Bullock, his younger son, left his wife and fled with Lady Coryanne Wylde to Pentos.
- ↑ 1.0 1.1 1.2 Fire & Blood, A Surfeit of Rulers.
- ↑ Fire & Blood, Birth, Death, and Betrayal Under King Jaehaerys I.