Mother Teresa is set to become a saint on September 4, 2016 after the Vatican announced on Friday to commemorate her second miracle.
Mother Teresa received a state funeral after her death in September 1997 in Kolkata. Her grave in her order's headquarters in Kolkata has become a pilgrimage site since then.
She was granted Indian citizenship in 1951.
Already as Mother Teresa, she went to Armenia to help those suffered in 1988 destructive earthquake.
Mother Teresa with Chairman of the Norwegian Nobel Committee, John Sanness, after she was awarded with 'Nobel Peace Prize' in Oslo on December 10, 1979.
Following her mission to care for the sick and poor, Mother Teresa travelled all over the world, including East Beirut, Lebanon, where she took care of 37 mentally handicapped children.
The second miracle, attributed to the nun and recognised by Pope Francis this week, was the curing of a Brazilian man suffering numerous brain tumours in 2008.
In 2002, the Vatican officially recognised a miracle she was said to have carried out after her death, namely the 1998 healing of a Bengali tribal woman who was suffering from an abdominal tumour.
During the beatification process, the Vatican called on Hitchens to play the ancient role of 'devil's advocate' and present arguments against her being blessed.
Mother Teresa was beatified by then pope John Paul II in a fast-tracked process in 2003, in a ceremony attended by some 300,000 pilgrims. Beatification is a first step towards sainthood.
She started her own order called the Missionaries of Charity in 1950 and opened her first home for the destitute and dying two years later.
She began her missionary work with the poor of Kolkata in 1948 and the teeming eastern metropolis, remained her base until her death in September 1997.
At the age of 18, she joined the Irish order, the Sisters of Loreto, beginning life as a teaching nun at one of its sister houses in Kolkata.
Arriving in India as Agnes Gonxha Bojaxhiu in 1929, two years later she took her first religious vows as a nun and adopted the name under which she would achieve worldwide recognition.
By the age of 12 she had become convinced that she should commit herself to a religious life and should travel to India to care for the poor.
A Nobel peace prize winner and known as the Angel of Mercy or the Saint of the Gutters for her tireless work in Kolkata slums was born in the Ottoman Empire (now the territory of the Republic of Macedonia), in the city of Skopje.