Sivapuranam is being part of the Saiva work ‘Thiruvachakam', written by the Saiva Saint Manickavachakar who is believed to have lived during the end of 9th Century A. D. It needs no other explanation than the saying: "thiruvAchakaththukku urukAdhAr oru vAchakaththukkum urukAr". திருவாசகத்திற்கு உருகாதார் ஓர் வாசகத்திற்கும் உருகார்.