Question about the Samādhirāja-sūtra I have a similar question about the Samādhirāja-sūtra.

Is the Samādhirāja-sūtra, a mahAyAnA sUtra or does it occur in the nikAyas or somewhere else? What is the historically accepted date of this sUtra? Does this sUtra precede nAgArjuna or is it a post-nAgArjuna sUtra?
It's a Mahayana sutra. Info. about the Samadhiraja sutra from the wiki page here. Full infos. and whole sutra is available here.