As per stories associated with Lord Venkateswara of Tirupati, Vakula Matha, the foster mother of Lord Venkateswara on earth was the rebirth of Yashoda.
Yashoda was the foster mother of Little Krishna in Dwapara Yuga. Yashoda who witnessed his childhood miracles was worried that she could not perform even a marriage to Krishna. She was not fortunate enough to see any of his marriages as well.
To condone her anguish, Krishna gave her a boon, “Oh mother! I will be born as Srinivasa (Venkateswara) in the Kali Yuga. At that time, I will marry Padmavathi, daughter of Akasha Raju. You will have the privilege of performing that marriage.” Yashoda of Dvapara Yuga took rebirth in Kali Yuga as Vakula Matha.
Vakula Matha took care of Srinivasa like his own mother. Srinivasa could relish her maternal affection once again.
Once, Srinivasa went to the hillside for hunting. There, he saw Padmavathi chased by a herd of elephants. Protecting her from the attack of elephants, Srinivasa fell in love with her. Her maids drove him away hurling stones at him.
Vakula Matha was agitated to see Srinivasa bleeding. Srinivasa recounted his story of love for Padmavathi and requested her to mediate with Akasha Raju for the alliance.
Vakula Matha was hesitant if a king like Akasha Raju would accept the alliance with vagrants like them. Then, he revealed the secret that she was Yashoda and he was Krishna of Dvapara Yuga.
Not only this, another secret is Padmavathi, daughter of Akasha Raju, was Vedavathi of Treta Yuga.