Sūta said: Then the glorious lord Brahmā became engaged in Prāṇāyāma. He thought of the supreme lord Śiva within his heart. With his mind engaged in meditation he resorted to lord Aghora. He contemplated on him in the form of Brahman. When Brahmā was meditating thus, lord Aghora of terrible exploits granted him vision. Thereupon four noble sons appeared from his sides. They were black in colour and they wore black garlands and unguents. They were Kṛṣṇa, Kṛṣṇaśikha, Kṛṣṇāsya, and Kṛṣṇavastradhṛk.