Bogar is a Siddhar, he is considered as one of the 18 siddhars born in the world. According to epigraphical sources and his book Bogar Seven thousand his period is around 3000 B.C. Bogar born at India and visited China in search of truth of life, he gained knowledge in medicine, astrology, spirituality, yoga etc.
Bogar anticipating that in due course of period, human beings will suffer from large number of disease. As an expert in medicine he used 4448 rare herbs and made 9 poisonous medicine, mixing these 9 poisons into one needs great knowledge and skill, to make a Master Medicine ( One medicine to cure all disease ). Thirumoolar also discuss one such Master Medicine in his book Thiru Mandiram. With the consultation of Agasthiar ( Father of Ayurvedic Medicine) and other siddhars Bogar mixed the 9 poisons ( Nava Bashanam ) and made the Master Medicine in the form of Lord Murugan which is currently worshiped at Palani Murugan temple. There is a place near Palani Hill called Thanasiappan Temple which is the place were Bogar mixed the Nava Bashanam and made the Murugan idol.
Bogar and others then decided that by using the milk and panchamirtham (a sweet recipe) poured on the idol, one can extract the medicine from the idol. The milk and panchamritham then becomes medicine to cure disease. After installing Lord Murugan Navabashana idol at the Palani Hill, Bogar used to worship it with milk abishegam (pouring milk on the idol) and panchamirtha abishegam (pouring panchamirtham on the idol).
His disciple Pulipani siddhar then took over the job of Lord Murugan pooja after Bogar went into Nirvigalpa Samadhi – the highest samadhi stage; where the Mind dissolves with Matter and Energy. Bogar Samadhi is inside Palani Murugan temple at Palani Hill. Actually Bogar himself constructed his samadhi exactly under the Lord Murugan Navabasha idol and went into Nirvigalpa Samadhi there. The entrance to his samadhi is a cave like structure, now also worship for this great siddhar is conducted at this entrance where he is last seen by his disciples which are at the Palani temple.