"Gangaikonda Cholan" was refered as 'Siriya Thaathai' by Rajendra Chola - 2. That is he was the younger brother of Rajendra Chola - 1
But we are aware Rajaraja Chola - 1 had only one son by him, that is Rajendra Chola - 1. Hence the Siriya Thaathai referred above is definitely a step-son of Rajaraja - 1 younger to Rajendra Chola - 1
Then the question rises who is the brother of Rajaraja Chola - 1 ??
Obviously not Aditya Karikalan as he has met his death in the hands of conspirators, and if he had a son in all possibility he would have been elder to Rajendra Chola - 1.
But the Thiruvaalankaadu Copper Plates states the Chola Prince who was with Rajendra Cholan - 1 in his Gangetic expedition was his younger brother.
We also know Mathuraanthahan Kandaraathiththan the son of Utthama Cholan, was the step-brother of Rajaraja - 1 and would have been younger to him.
Hence my inference is - if - Mathuranthahan Kandaraathiththan had a son he would have been younger to Rajendra Chola - 1 and as mentioned in the Thiruvaalankaadu plates this step-brother could have been the one who was with Rajendra Chola - 1 in the Gangetic expedition.
But the question is have we got any evidence to say that Mathuranthahan Kandaraatiththan had a son?? (who lead the Gangetic expedition and received the title Gangaikonda Cholan). No - We have to still do more research to find same.
Further Karikala Kannan identified by Prof Nilakanda Sastri as Aditya's son in all possibility would have been elder to Rajaraja and hence Rajendra - 2 should have called him as 'Periya Thaathai'.
kalinga balu told me that Rajendra-I went along with the army/warroirs upto pichavaram to see them off and wish them great success in the expedition that led to gangaikonda cholam..then he returned to GKCPM, his headquarters.. they went by by a waterway that existed between (or through) GKCPM and pichavaram which may have become the major port after nagapatnam was presumably destroyed by a heavy Tsunami...
the relavance of this information now is unless the chieftain was close to him or related to him Rajendra-I need not have to go all the way to Pichavaram to see him off..also that he gave the title to him, the step-brother, lends credence to his existence..
may i request the seniors to share their thoughts on this issue...
I have included many evidences upto now in my Thread titled, "The Medieval Chola Empire and its relations with Malaysia, Indonesia & Thailand" in the Mayyam Hub Website. Much more evidences and texts are to be added very soon. Informations you were seeking re Airlangga, his marriage, and re Sri Vijaya Asrama are also discussed. My Thread has now grown into the third Part.