Dissembling: David
Source: Nav
1 Samuel 21:13–15
So he changed his behavior before them and feigned madness in their hands; he scratched on the doors of the gate and let his saliva run down his beard. / Then Achish said to his servants, “Look, you can see that the man is insane! Why have you brought him to me? / Am I in need of madmen, that you have brought this man to rave in my presence? Must this man come into my house?”