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The 7th-century CE Jambulinga Temple is one of the first trikutachala garbhagriha (three-celled sanctum) temples in Karnataka. The relief of Shiva and Parvati riding the Nandi is exquisitely executed on the ceiling. Source
As per ASI booklet, Jambulinga temple was constructed in 699 CE at the behest of rani Vinayavati, mother of Chalukyan king Vijayaditya. Dedicated to Brahma, Vishnu & Maheshwara, this east-facing temple is a Trikutachala i.e. a temple with three sanctums. Source
An ancient inscription declares that this historical temple was constructed in 699 AD. It has three beautiful chapels that are dedicated to Lord Brahma, Vishnu, and Mahesh (Shiva). Source