Devibhagavatapurana 3.27.49

3.27.49

rājyabhraṣṭena rāmeṇa sītāvirahitena ca |
kiṣkindhāyāṃ vrataṃ caitatkṛtaṃ duḥkhātureṇa vai ||

In former days, S’rî Râma Chandra suffered very much owing to his being deprived of his kingdom; and, then on account of his wife being stolen away. Subsequently he performed this Navarâtra vow in Kiskindhyâ, his heart being heavily laden with grief.