> But, the fact about Pachavanmadevi seems to be true. She was a > devardaiyal referred to by the name 'Thillai azhagi'. I believe, she > was born to 'Ambalavan Nakkan' a cheiftian of RRC and a devaradiyal.
This requires further studies. Kuvalalayaththar Ambalavanan Pazhuvoor Nakkanaana Vikrama chozha Maarayar was by no means an ordinary person. If Thillai azhagi was indeed a daughter of this gentleman (forgot what is the inscription that links these two) there was no need for him to give away his daughter as a devar adiyar. we can speculate some drama behind all this.
> Devaradiyals born of royal blood, were reserved for the king, I > suppose.
Oh No no ! Not at all ! Almost all devar adiyars - as the name implies are those who became devotees of the lord. Few did marry (Chathuran chathuri of Thiruvotriyur marries Nagan perungaadan) but most were doing temple service. Those who evendually did not marry were called padhiyilar. Relatively more provisions were made to the latter during endowments