The cult of Shiva is among the longest continuous devotional traditions on earth. The pashupati seal unearthed at Mohenjo-daro and dated to roughly 2500 BCE — a horned figure seated in what reads as a yogic posture, surrounded by animals — was proposed by John Marshall in 1931 as a proto-Shiva. The identification has been contested, by Doris Srinivasan among others, and is best held lightly; but the Vedic Rudra of the Rig Veda, fierce and ambivalent, is unmistakably the same deity who is later named Shiva — the auspicious one — in the post-Vedic literature, and who crystallises in the Mahabharata and the Puranas as the Mahādeva of the developed Hindu pantheon.
The temples are younger than the cult. The Brihadeeswara at Thanjavur, raised by Rajaraja Chola in 1010 CE, is the high-water mark of imperial Chola Śaivism — its sixty-six-metre vimana the tallest in India of its time. The Lingaraj at Bhubaneswar, completed under the Somavamshi dynasty in the eleventh century, codifies the Kalinga school of temple architecture. The histories of Kashi Vishwanath and Somnath are violent ones — repeatedly destroyed under Aurangzeb and earlier Ghaznavid raids, repeatedly rebuilt — and in the modern period have become inseparable from the politics of Indian national identity.
Adi Shankara, the eighth-century philosopher of Advaita Vedanta, played a particular role in consolidating the geography. The Dvadasha Jyotirlinga Stotram and the establishment of the four cardinal mathas at Sringeri, Dwaraka, Puri, and Jyotirmath both worked to bind the subcontinent into a single pilgrimage circuit — a Smarta reform that brought the worship of Shiva, Vishnu, Devi, Surya, and Ganesha into one liturgical framework while leaving the older Śaiva sectarian traditions intact.
The living tradition is dense. Daily abhishekam — the bathing of the lingam in milk, water, honey, and curd — continues in every functioning Śaiva temple. Maha Shivaratri, the great night of Shiva each February or March, draws tens of millions to night vigils across India and Nepal. The Amarnath yatra in Kashmir takes pilgrims through the high passes to a cave shrine where an ice lingam forms each summer. During the Hindu month of Shravan, the Kanwar Yatra sees lay pilgrims walking hundreds of kilometres barefoot, carrying pots of Ganga water on shoulder-yokes to pour over a Shiva lingam at home. The cult of Shiva is older than its temples, and it is not slowing.