Ambarisha
Ambarisha (, ) was an Ikshvaku king and son of Mandhata. He is believed to have conquered the whole world in a week. He lived in Treta Yuga. Section::::"Bhagavata Purana" legend. According to the Bhagavata Purana, he was a great devotee of Vishnu and adhered firmly to the truth. Being pleased with his devotion, Vishnu had given his Sudarshana Chakra to Ambarisha, who worshiped the Lord's weapon with great devotion. Once, Ambarisha performed the "Dvadashi Vrata" at Vrindavan, which required that the king must start a fast on Ekadashi and break it at the start of Dvadasi and feed all  the people. As the moment of breaking the fast was drawing near, the mighty sage Durvasa arrived and was received with all honours by Ambarisha. Durvasa agreed to the king's request to be his honoured guest, and asked the king to wait until he finished his bath in the Yamuna river and returned. As the auspicious moment approached when the king had to break his fast to fulfill the vow of the "vrata", Durvasa did not turn up. On the advice of his priests, the king broke his fast by taking a little water and waited for the arrival  of sage Durvasa to offer him food. Durvasa, who was well known for his short temper, felt that Ambarisha had violated the respect due to a guest by breaking his fast before the guest had taken his meal, and in his rage created a demon to kill Ambarisha, out of a strand of his hair. Because Ambarisha was a great devotee, the Sudarshana Chakra intervened, destroyed the demon and started chasing Durvasa himself. Durvasa went to Brahma and Shiva for protection. Both pleaded their inability to save him. He went to Vishnu himself, who said that he could do nothing  as he was bound by the blemishless devotion of Ambarisha and suggested to the sage to seek the pardon of the king. Durvasa went to Ambarisha, who prayed to Lord Vishnu to recall the Sudarshana and save Durvasa. Thus Durvasa's life was spared.