Queen Sophia of Spain attends the holy mass and canonisation for Mother Teresa of Kolkata, on Saint Peter's Square in the Vatican, on September 4, 2016.

Mother Teresa, the celebrated nun whose work with the poor of Kolkata made her an instantly recognisable global figure, will be proclaimed a saint on September 4, 2016. Pope Francis will preside over a solemn canonisation mass in the presence of 100,000 pilgrims and with a giant haloed portrait of Teresa smiling down from St Peter's Basilica. / AFP / ANDREAS SOLARO        (Photo credit should read ANDREAS SOLARO/AFP via Getty Images)