Tirukoyilur

As per legend, the three azhwars were once were confined in a small dark enclosure during a rain in Thirukovilur and they experienced a fourth individual among them. They found out that it was god Vishnu and Poigai Azhwar wished to see his face continuously but could view only from the simmering light of the lightning. With a view to maintain the continuity of light, Poigai instantly composed hundred songs wishing light to emerge. Pey Azhwar and Bhoothath Azhwar continued composing hundred songs each on Vishnu. The works of these earliest saints contributed to the philosophical and theological ideas of Vaishnavism.

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Pey

 https://en.wikipedia.org/wiki/Pey_Azhwar

https://en.wikipedia.org/wiki/Madhava_Perumal_temple

https://en.wikipedia.org/wiki/Adikesava_Perumal_temple,_Mylapore