Our dear member Virarajendra @ ratnasabapthy mailed these details as early in 2004 ::
re Adhi Sankara ::
It was during the period of the Chera king Kulasekaran and partly during the period of the Chera king Rajasekaran, the great Saiva Saint of Chera (Kerala) country namely the Sankaracharya who founded the Advaita doctrine lived in Kerala.