Mother Teresa was an Albanian Catholic Nun.
She was born in 1910, in a small town, in what is now called the Republic of Macedonia.
She first became a Loreto Sister, but after some time, she heard a calling from God to serve the poor; it was a calling to serve the poorest of the poor.
In order to do this, Mother Teresa founded a new religious order of nuns called Missionaries of Charity, in Calcutta, in India.
For over 45 years she ministered to the poor, sick, orphaned, and dying, while guiding the Missionaries of Charity's expansion, first throughout India and then in other countries. Following her death she was beatified by Pope John Paul II and given the title Blessed Teresa of Calcutta.
Mother Teresa died of a heart attack in September 1997. She was 87 years old.
The pope will recognise her a Saint when a second miracle is confirmed.