Viṣṇu
Viṣṇu’s name means All Pervasive, and in the Trimurti he is the Preserver beside Brahma and Shiva. Little prominent in the Vedas, he rose to importance in the last centuries BCE, when he was identified with Vasudeva-Krishna and Narayana.
Whenever evil and chaos threaten the world he descends as an avatar to restore order and protect dharma. Of the ten Dashavataras, Rama and Krishna are the most worshipped.