Saurapurana 30.65

30.65

labdhavānparamāṃ bhaktiṃ śive śivaparākramaḥ
rāmeśvara iti khyāto mahādevaḥ pinākadhṛk

attained supreme devotion to Śiva, possessing the valor of Śiva. / Mahādeva, the wielder of the Pināka, is celebrated as Rāmeśvara;