Vishnu is the primary focus of Vaishnavism-focused Puranas genre of Hindu texts. Of these, according to Ludo Rocher, the most important texts are the Bhagavata Purana, Vishnu Purana, Nāradeya Purana, Garuda Purana and Vayu Purana. The Purana texts include many versions of cosmologies, mythologies, encyclopedic entries about various aspects of life, and chapters that were medieval era regional Vishnu temples-related tourist guides called mahatmyas.