VATICAN CITY — Pope Francis approved sainthood on Tuesday for Mother Teresa, a Roman Catholic nun known as the “saint of the gutters” who founded a religious order dedicated to assisting the poorest of the poor.

She will be made a saint on Sept. 4, 13 years after her beatification and 19 years after she died at age 87.

The pope cleared the way for sainthood in December by approving a second miracle attributed to her, which involved the healing of a Brazilian man who had suffered a viral brain infection that left him in a coma.

An ethnic Albanian born Agnes Gonxha Bojaxhiu on Aug. 26, 1910, in Skopje, Macedonia, then part of the Ottoman Empire, she took her religious vows at age 21, two years after arriving in India.