In later Hinduism, she is described as the daughter of the Prajapati Daksha and his spouse Panchajani, and the consort of the sage Kashyapa.
In the Rigveda (I.32.9), she is identified as the mother of Vritra, the asura slain by Indra.
(Others were) Dviraṣṭamūrdhā, Śakuni, Śaṅkuśirodhara, Ayomukha, Śambara, Kapila, Vāmana, Marīci, Māgadha, and Hari.
Gajaśiras, Nidrādhara, Ketu, Ketuvīrya Taśakratu, Indramitragraha, Vrajanābha, Ekavastra, Mahābāhu, Vajrākṣa, Tāraka, Asiloman, Puloman, Vikurvāṇa, Mahāpura, Svarbhānu, and Vṛṣaparvan—these and others were also Danu's sons.
[4] Danu was struck by Indra's thunderbolt after hearing him kill her son Vritra.