Ramadevar Siddhar alias Yacob Siddhar (இராமதேவர்சித்தர் (அ) யாகோபுசித்தர்).

                    ஏணிஎன்ற வாசியை நீ பாய்சிப்பாரு
                        என்ன சொல்வேன் சோதிமயங் காணுந்தானே
                    சோதியதிர் சொக்கிடுவாய் சொரூபாரூபம்
                        தோன்றுமே வாசியென்ற மனத்தினாலே
                    சாதிபேதம் வையாதே தரணிமீது
                        சாற்றுவேன் மனத்தானே சிவந்தானையா
                    ஆதியென்ற ரவிமதியும் மனத்தினாலே
                        அரகரா வெண்சாரை மனத்தினாலே
                    பாதிமதி சடையணிந்த தம்பிரானும்
                        பரிவாக உன்னுள்ளே நோக்கிப்பாரே 
                    கள்ளமில்லா மனதையடா நோக்கிப்பாரு
                        கருவான கருவிளமே கலந்துசேரே !!
                                    -யாகோபு வாத சூத்திரம்
     
விளக்கம்:
வாசியோகத்தை சரிவர செய்து வந்தால் சோதியை காணலாம், கண்டபின்பு அதனுள் மனதை
வைத்து சொக்கி வந்தால் சிவனை காணாலாம். மனதுதான் சிவன். ஜீவனே சிவன். அதைவிடுத்து 
சாதிபேதம் பேசி, சஞ்சலத்தில் ஆட்ப்பட்டு வாழ்நாட்களை  வீணடிக்க வேண்டாம் என்கிறார் 
சித்தர் இராமதேவர்.

Ramadevar Siddhar Life History:

Ramadevar siddhar temple jeeva samadhi — Image of Ramadevar Siddhar

Ramadevar siddhar or Uromarishi or Yacob Siddhar occupies a distinct and significant part in the Tamil Siddha Medicine System for his discoveries in all the spheres of Siddha Science.
An eminent thinker and lively researcher, was well known for his simple usage of Tamil language to describe extraordinary concepts in Siddha Science.
Ramadevar Siddhar, a scion of great Pulasthiyar, who himself the favorite disciple Sage Agathiyar was in Nagapattinam of Tamil Nadu.
Bogar in his biographies about Siddhas says, he was born in a Brahmin family.
After entering into the world of Siddha science, Siddhar Ramadevar by the dint of his deep meditation techniques awakened his kundalini energy.
He succeeded in bringing the energies through the chakras up to the crown and united with divine for long.
He attained perfection in Attama siddihis and said to have performed many miracles called Jaalam in Tamil.
He has the habit of slipping into the macro cosmic world even while walking sleeping etc.
Unknowingly he went to Arabic
Reference from BOGAR-7000, Proof that Yacobu siddhar was in Mecca

country once and was confronted by Arabs and converted him into an Arab.
He was sermonized as an Arab and given the name Yakub/yacob.
Even as an Arab he worshiped nabigal nayagam, the messenger of Allah in mecca and got his blessings and compiled his works on Siddha medicine, Siddha yoga and Siddha gnana philosophies.
He went into samadhi for 40 years in mecca.
Getting directive from the great Siddha alchemist Bogar, he returned to Tamil nadu from mecca and stayed in Sathuragiri hills and translated his works to Tamil from Arabic.
His works encompasses all the aspects of Siddha science i.e…alchemy, yoga, gnana, Siddha medicine, Siddha medicine preparation methods, Synthesis of Muppu salt and performing miracles.
He has also compiled works on various methods of cleaning or killing the toxicity of metals and materials used in the Siddha Medicine System.
The wordings and use of language in his works enables readers to easily understand about the Siddha medicine system.
His works also answers the question “How to awaken kundalini energy and bring it up stepwise?”.
He finally attained jeeva samathi at Alagar malai in Madurai.