Basil
From Wolfire Games Wiki
Basil was a guard at Rock Hall when Turner staged his bloodless coup against the king Hickory.
After Turner returned, he doubted his ability, and convinced Turner that he(Turner) was not fit for the throne.
It is not clear on whether he remained as a guard after the events of Lugaru.
Trivia
Basil is also the name of 'Basil Hare', a popular character in the Red Wall series. The naming is most likely a homage to the character.