Studies in the Upapuranas
by R. C. Hazra | 1958 | 320,504 words
This book studies the Upapuranas: a vast category of (often Sanskrit) literature representing significant historical, religious, and cultural insights of the ancient Indian civilization. These Upa-Purana texts provide rich information, especially on Hinduism covering theology, mythology, rituals, and dynastic genealogies....
Chapter 9.18 - The Rudra-purana (study)
This work [rudra-purana] is not mentioned in any of the lists of Upapuranas. A verse (on the result of fasting on the Ekadasi Tithi) is found quoted from this work in Hemadri's Caturvarga-cintamani.75 So, it must have been written not later than 1000 A.D. The Rudra-purana does not seem to be the same as the present Siva-purana, because the quoted verse, mentioned above, smacks of Vaisnavism and does not occur in the latter work.
75 Caturvarga-cintamani, III. ii, p. 152- rudra-purane 'yah karoti naro bhaktya ekadasyam uposanam/ sa yati visnu-salokyam yati visnoh sarupatam//'