His Holiness Siddhar Kaaviriyaatrangarai Karuwooraar who built the Thanjavur Big Temple was the 11th Pathinensiddhar Peedaathipathi.
Out of all the people who visit the Thanjavur Big Temple only half of them would usually go to the main sanctum sanctorum to worship Periya Udaiyaar. But all the people would definitely worship Siddhar Karuwooraar who has His sannidhaanam behind the main Tower nearer to the well. Particularly the people who live in Thanjavur district and the nearby districts worship Siddhar Karuwooraar as their family deity.
Many people worship Siddhar Karuwooraar on Thursdays considering that day of the week as the day for Guru. A lot more keep and worship the portrait of His Holiness at their houses in the prayer room. All of them consider His Holiness as their Guru or Gurusamy or Gurudevar or Gurunaathar and remember to worship Him at every instance.
Thus His Holiness Siddhar Karuwooraar of the Thanjavur Big Temple has a lot of devotees, many organizations, weekly prayers, … etc in His name. But in Tamilnadu there is no interest to know anything based on Historical perspective. That is why nobody has come forward to know the History of His Holiness Siddhar Kaaviriyaatrangarai Karuwooraar who built that Thanjavur Big Temple and functioned as the 11th Pathinensiddhar Peedaathipathi.