Adi Shankaracharya and Narsimha.

श्रीमत् पयोनिधि निकेतन चक्रपाणे | भोगीन्द्र भोग मणिरंजित पुण्यमूर्ते,

योगिश शाश्वत शरण्य भवाब्धि पोत | लक्ष्मीनृसिंह ममदेहि करावलम्बम् ||

In Kaliyuga, Sri Adi Shankaracharya composed the Narsimha Karaavalamba Stotra.

Adi Shankara, who was in parakaya pravesh, sought the help of Lord Narsimha, when he sensed that his body was being burnt. At that time, when he recited the Karaavalamba Stotra, the Lord is belived to have appeared before Adi Shankara and relived him from his misery. On another occasion, Adi Shankara was saved from Kaapalika, the black magicia, by Lord Narsimhaswamy, who descende upon Padmapaada, the ardent disciple of Adi Shankara and killed Kaapalika.