The most fundamental of Hindu deities, is the Trinity of Brahma, Vishnu and Shiva - popular deities include Ganesha, Krishna, Hanuman and goddesses like Lakshmi, Durga,Saraswati.
Sri Madana Mohana, Sri Govinda and Sri Gopinatha
It is said that Vajranabha, the great-grandson of Krishna, first had three Deities of Krishna carved. He never saw Krishna, so they were carved from the description of Uttara, the mother of Maharaja Pariksit (others say it was Usha his mother). He had three different images carved, but none of them were perfect. Govindaji resembled the face (Mukharabinda), Madana Mohana resembled the navel down to the lotus feet, and Gopinatha resembled the trunk of the body, from the navel to the neck.
In Padma Purana it is said that to get the full vision of Sri Krishna, you have to visit and pay obeisance to all three Deities in a single day, while the sun is still up. Sri Govinda and Sri Gopinatha are now in Jaipur and Sri Madana Mohana is in Karoli, a small town in Rajasthan.