Uppalavarna was a famous nun whose wisdom was compared with that of Maudgalyayana, a great disciple of Buddha. She was, indeed, the nun of all nuns and was always their leader, never tiring of teaching them.
Devadatta was a very wicked and cruel man who poisoned the mind of King Ajatasatru and persuaded him to turn against the teachings of Buddha. But later, King Ajatasatru repented, broke off his friendship with Devadatta, and became a humble disciple of Buddha.
At one time when Devadatta was repulsed from the castle gate in an attempt to see the King, he met Uppalavarna coming out. It made him very angry, so he struck and seriously wounded her.
She returned to her convent in great pain and when the other nuns tried to console her she said to them: "Sisters, human life is the unforeseen, everything is transient and egoless. Only the world of Enlightenment is tranquil and peaceful. You must keep on with your training." Then she passed away quietly.