Aandal - Goddess Lakshmi’s Incarnation

Wikipedia Says,

Periazhwar (originally called Vishnuchittar) was an ardent devotee of Lord Vishnu and he used to string garland to Vishnu every day. He was childless and he prayed to Vishnu to save him from the longing. One day, he found a girl child under a Tulasi plant in a garden inside the temple. The child was goddess Lakshmi itself incarnated to test the devotion of alvars.He and his wife named the child as Kothai, who grew up as a devotee of Lord Krishna, an avatar of Vishnu. She is believed to have worn the garland before dedicating it to the presiding deity of the temple. Periazhwar, who later found it, was highly upset and remonstrated her. Vishnu appeared in his dream and asked him to dedicate only the garland worn by Andal to him. The girl Kothai was thus named Andal and was referred as Chudikodutha Sudarkodi (lady who gave her garland to Vishnu). The practise is followed during modern times when the garland of Andal from Srivilliputhur Andal Temple is sent to Azhagar Koyil on Garudostavam during the Tamil month of Purattaasi (September - October) and Tirumala Venkateswara Temple during Chitra Pournami.

Andal is the only female Alvar among the 12 Alvar saints of South India. The Alvar saints are known for their affiliation to the Srivaishnava tradition of Hinduism. Andal is credited with the great Tamil works, Thiruppavai and Nachiar Tirumozhi, which are still recited by devotees during the winter festival season of Margazhi.