The term 'MOTHER OF KOLKATA' is a reference to the late Mother Teresa, who was a Roman Catholic nun and missionary. She was born in Skopje, Macedonia, and moved to India in 1929, where she founded the Missionaries of Charity in 1950. She dedicated her life to helping the poor and sick in Kolkata (formerly Calcutta), India, and was awarded the Nobel Peace Prize in 1979 for her humanitarian work. Her given name was Agnes Gonxha Bojaxhiu, but she is best known by her religious name, Teresa, which is the six-letter solution to this crossword puzzle.