Mother Teresa is being canonised by Pope Francis on September 4, 2016 at Vatican City.
Mother Teresa dedicated her entire life to serving the poorest of the poor as well as the destitute and forsaken.
The Catholic Church posthumously confers sainthood on people considered so holy during their lives that they are now believed to be with God and can intercede with him to perform miracles.
Mother Teresa died in 1997.
Canonization is the process by which the Catholic Church solemnly proclaims that a holy person becomes inscribed on the list (i.e. the canon) of those persons who may be venerated publicly in the liturgy of the Catholic Church.
After beatification, which for Mother Teresa was in 2003, a second miracle is required in order for the cause to move on to sainthood.
This involved Brazilian Marcilio Andrino, who the Church says unexpectedly recovered from a severe brain infection in 2008 after his family prayed to Mother Teresa.