Sītāp Piraṭṭi is the Tamil honorific name for Sītā Devī, the divine consort of Śrī Rāma in the Vālmīki Rāmāyaṇa and the Rāmāvatāra of Viṣṇu. The word Piraṭṭi (Sanskrit: Pirāṭṭi, cognate with Śrī) means 'the royal lady' or 'She who is the consort of the Lord', and is the standard Tamil designation for the supreme Goddess in her various forms — Śrī, Bhūmi, and Nīḷā.
In Śrī Vaiṣṇava theology, Sītā Devī is understood as an avatāra of Śrī Mahālakṣmī, inseparable from Bhagavān in all his incarnations. Just as Lakṣmī accompanies Viṣṇu as his eternal consort (nitya-vibhūti), so does Sītā accompany Rāma. Her role as purushakāra is central to the Śrī Vaiṣṇava understanding of surrender: she is the divine mother who intercedes with Bhagavān on behalf of the devotee, softening his role as judge and presenting the chastened soul in a favourable light. This is analogous to the role of Āndāḷ in the Divya Prabandham context.
Sītā Devī's patient endurance in the Aśoka forest, her absolute refusal to consider any alternative shelter (gati) other than Rāma, and her compassionate advocacy for Rāvaṇa's forces at the end of the war are all cited by pūrvācāryas as supreme illustrations of pāratantrya (total dependence on Bhagavān) and kāruṇya (compassion). Temples at Śrī Raṅgam, Tirunārāyaṇapuram (Mēlkōṭe), and Śrīrangapaṭṭaṇam honour her alongside Śrī Rāma.