I had also written that Shiva is mentioned only in the passing in the Vedas but is referred to constantly in Tamil Literature calling Shiva as The Unborn Elder and He is recorded as having founded the Tamil language with Subrahmanya.
Normally one does not find Brahman given more importance in the Puranas as each Purana extolls the virtues of the God on whose name the Purana is named. Matsya Purana, Purana meant to extol the Virtues of Vishnu speaks of Brahman ordering and assigning jobs to the Trimurti. What is interesting is that this chapter (Chapter 6) does not state that a particular God, Shiva, Vishnu as the embodiment of Brahman. Instructions by Brahman.
The Dwadasa Jyotir Linga Kshetra stotra describes the twelve places of Shiva. द्वादशज्योतिर्लिङ्गानि - सौराष्ट्रे सोमनाथं च श्रीशैले मल्लिकार्जुनम् Dwadasa Jyotirlingani - Saurastre Somanatham Ca Shrishaile Mallikarjunam.