Kashmir Shaivism is a group of nondualist Tantric Shaiva exegetical traditions from Kashmir that originated after 850 CE. This tradition is also termed the Trika school and was actually pan-Indian, also flourishing in Orissa and Mahārāṣṭra.
The Tantrāloka, Mālinīślokavārttika, and Tantrasāra of the Kashmirian Abhinavagupta (975–1025 CE) are formally an exegesis on the Mālinīvijayottara Tantra, although they also drew heavily on the Kali-based Krama subcategory of the Kulamārga.
Kashmir Shaivism claimed to supersede Shaiva Siddhanta, a dualistic tradition which scholars consider normative tantric Shaivism. The Shaiva Siddhanta goal of becoming an ontologically distinct Shiva (through Shiva's grace) was replaced by recognizing oneself as Shiva who, in Kashmir Shaivism's monism, is the entirety of the universe.
Dating from around 850-900 CE, the Shiva Sutras and Spandakārikā were the first attempt from the Śākta Śaiva domain to present a non-dualistic metaphysics and gnostic soteriology in opposition to the dualistic exegesis of the Shaiva Siddhanta. The Shiva Sutras appeared to Vasugupta in a dream, according to tradition. The Spandakārikā was either composed by Vasugupta or his student Bhatta Kallata.
Somananda, the first theologian of monistic Shaivism, was the teacher of Utpaladeva, who was the grand-teacher of Abhinavagupta, who in turn was the teacher of Ksemaraja.
The Tantrāloka, Mālinīślokavārttika, and Tantrasāra of the Kashmirian Abhinavagupta (975–1025 CE) are formally an exegesis on the Mālinīvijayottara Tantra, although they also drew heavily on the Kali-based Krama tradition of the Kulamārga.