I'm currently visiting India, and I just saw the Varadaraja Perumal Vishnu temple in Kanchipuram. As I discuss in this question this is the site of a Yagna performed by Brahma which Saraswati tried to thwart but Vishnu stopped her. Varadaraja Perumal, the main deity of the temple, is the form of Vishnu that appeared before Brahma in the Yagna.
But there is another Vishnu statue in the temple, a statue of Vishnu's incarnation Narasimha the man-lion. Here is what the priest told me about the statue. As I discuss in this answer, it is Vishnu's incarnation Varaha the boar, and not Venkateshwara, who was the original inhabitant of the seven hills of Tirupati. And then Venkateshwara had to get permission from Varaha to stay there. The priest said that similarly, it is Narasimha who is the Sthaladhipati or owner of the place where the Varadaraja Perumal temple is now, and Varadaraja Perumal is just "renting" it from Narasimha.
So my question is, what is the story of the Narasimha deity of the Varadaraja Perumal temple? Why did Narasimha appear in or come to Kanchipuram? And what interactions did Varadaraja Perumal have with Narasimha? Did he get Narasimha's permission so Brahma could do his Yagna there?
Does the Sthalapurana of the temple shed any light about this?