Faisal is a character mentioned only by Amy. He is a Saudi Arabian prince who is Amy's former fiancé and funds her laboratories.
Biography
In "The Benefactor Factor", Amy tries to persuade Sheldon to come make a case for the university's party/fundraiser, Amy tells Sheldon that her lab is being funded by a prince she met in Saudi Arabia who had an interest in neurobiology, Faisal is technically her fiancé. Amy visits Riyadh for the winter.