His realm was protected by the Yajna avatara
'Apat svayambhuvantaram' (SB 1.3.12).
Manu
Svayambhuva Manu
स्वायम्भुव मनु
Svayambhuva Manu is the first Manu of the present kalpa and father of the human line: a son of Brahma, husband of Shatarupa; the Manusmriti is traditionally ascribed to him. SB 1.3.12: the Yajna avatara with the sura hosts protected his realm.
Śrīmad Bhāgavata Mahāpurāṇa 1.3.12 — Sanskrit Wikisource (pinned oldid=369178)