Raghupriya I just googled to find it is melakartha #42. Any close overlap to other major ragas. There is a reference to raghupriya with another name ravipriya too . To the best of my knowledge I have not heard it at all.
The below snippets Have 2 references to Raghupriya.
Bhagyalakshmi on Veena Played this wrote: 05 sadAnanda bhakti – Raghupriya – Kotiswarayyar [AS?]
Malladi Brothers sang this wrote: 4.himagirikumArI(raghupriyA i.e ravikriyA(Venakatamakhi scheme of mELAs), Adi, Dikshitar)-A,S at himagirikumArI.....