Hi,
yes there is an evidence that differ between tenkalai vaishnavas(who recite tamil vedas which was wrote by twelve azhwars) and vadakalai vaishnavas(Who recite samkrita vedas) also Saivas at the time of 2nd Chola King Mr.Kulasekhara. He warned all the Tenkalai batch at the time Ramanuja Charya and he has sent one of our priest to compramise but he hasn,t. Then all of us spread through out south from Tamilnadu (Tamilnadu, AP and Karnataka). In 12th century talapathras, Swami Ramanujacaharya said we are all vaishnavas and we should always be vaishnavas (that is called Sethada). Then it converted like sathathas and there is only a specified meaning for sethada is that always be. And when ever we starts feeding houses(Ramanuja Mattas) in the commencements of Sri Ramanujacharya we are going to start build up a specified community and differs from brahimism. Still most of the people even me wore sacred thread thats it from my side.
