Question: Who is the paternal grandfather of Bohemond Iii Of Antioch?
Answer: William IX

1099- 29 June 1149) was Prince of Antioch from 1136 to 1149. He was the younger son of William IX, Duke of Aquitaine and his wife Philippa, Countess of Toulouse, born in the very year that his father the Duke began his infamous liaison with Dangereuse de Chatelherault. Bohemond III of Antioch, also known as Bohemond the Child or the Stammerer (1148–1201), was Prince of Antioch from 1163 to 1201