St. Francis of Assisi is the inventor of the Nativity Scene

Source: Saint Bonaventure, Legends of Saint Francis of Assisi

Three years before he died, Francis decided to remember the birth of the Child Jesus in a very special and solemn way, so that the people of Greccio would grow in faith and devotion. To make sure no one thought he was joking, he asked for and received permission from the Pope. Then he had a manger prepared, brought hay to the place, and led a bull and a donkey there.

The brothers were called together, and many people came running. Songs filled the forest, and that holy night became bright and joyful, lit by shining lights and filled with hymns. It was a beautiful and peaceful celebration, full of heavenly light. Francis stood reverently before the manger, weeping with joy and deep devotion. Mass was celebrated at the manger, and Francis, a servant of Christ, sang the Gospel. He then preached to the people about the birth of the poor King, and when he spoke His name, he lovingly called Him the Child of Bethlehem.

There was a good and honest soldier named John of Greccio, who had given up his life as a soldier because of his love for Jesus Christ. He was a close friend of Francis. John said that he saw a beautiful little child sleeping in the manger, and that Francis held the child in his arms, as if trying to wake him. This vision is worthy of belief, not only because the man who saw it was holy and trustworthy, but also because later events and miracles confirmed it.

The example of Francis helps awaken faith in those who have grown careless and distracted by worldly things. The hay from the manger, which the people kept, was said to heal sick animals and protect them from harm. In this way, God showed His joy in honoring His servant Francis and made clear, through visible signs, the power of his prayers.