Thirumangai mannan Ceaser.

The well known story of how Thirumangai alwar waylaid rich persons near Thirumanam kollai and by diverting the taxes which he had collected in his area as a chieftain was feeding thousands of vaishnavite saints every day. The King got to know of this and put him behind the bars inside the temple. even today the priest point out the place where he was imprisoned. When he was in the Prison the Perumal appeared in his dream and told him that the sum equal to the money that was diverted by him would be found concealed in the bed of the river Vegavati near Kanchi. God asked him to reclaim that money and render unto Ceser what belonged to Ceser. Thirumangai alwar acted accordingly and got his release from the prison.
After this incident Thirumangai alwar prayed to the Lord to make him a vaishnavite so as to enable him to cross the last hurdle before marrying Kumudavalli. Perumal agreed to become his guru. The idol of Perumal in the Garba griha is seen with his two hands holding the Shanka and chakra as if to imprint the shanka and chakra on his disciple and perform the Samashrayam ceremony. Perumal here thence forth came to be known as Nambi