Skandapurana 5.52.19

5.52.19

helayā darśanaṃ prāptaḥ sarveṣāṃ dvijasattamāḥ ..
tataḥ prabhṛti tatsthānaṃ rudrakoṭītiviśrutam .. 19 ..

Effortlessly, he granted darśana to all, O best of brahmins. / From that time on, that place became renowned as Rudrakoṭi.