Gayatri Rajapatni (circa 1276?—1350) was the queen consort of Majapahit's founder and first king Kertarajasa Jayawardhana, and also the mother of Tribhuwana Wijayatunggadewi, the queen regnal of Majapahit. A devout Buddhist, she was the youngest daughter of Kertanegara, king of Singhasari. She was an influential figure within Majapahit inner palace and later in her life acted as the matriarch of Majapahit's Rajasa Dynasty. Tradition mentioned her as a woman of extraordinary beauty with exceptional charm, wisdom and intelligence.
Gayatri was raised as a princess in Tumapel palace, Kutaraja, the capital of Singhasari kingdom, East Java. Her name derived from Gayatri, the Hindu goddess personification of hymn and mantras. She was the youngest daughter of King Kertanegara. Her siblings are Tribhuwaneswari the oldest, Prajnaparamitha, and Narendra Duhita. Kertanegara did not have any son as his heir, instead he has four daughters, dubbed as the four Princesses of Singhasari. King Kertanegara was well known as a pious adherent of Tantric Buddhism, it is highly possible that Gayatri also exposed to Buddhism ideas and subsequently adhered the religion. Gayatri's eldest sibling, Tribhuwaneswari was betrothed to Prince Nararya Sangramawijaya (Raden Wijaya), still a relative of Kertanegara's extended family, and probably groomed to be his successor. According to tradition, Gayatri was mentioned as a keen and bright student in literature, social, political and religious matters.
In 1292 Gayatri witnessed the destruction of her home, the Singhasari kingdom, under the unsuspected attack of Jayakatwang, Duke of Gelang-gelang (Kediri). Yet she survived and escape unharmed from the burning palace, immediately discard her identity, hide and blend herself among the captured servants and slaves. His eldest sister, Tribhuwana, managed to escape and reunited with her husband, Raden Wijaya, while her other sisters, Prajnaparamitha, and Narendra Duhita, were captured by enemy forces and held as hostage in Kediri. For about a year she hide herself in Kediri palace posing as a servant.