At the end of the fourth century, a Spanish nun called Egeria went on pilgrimage to the Holy Places. Writing to her sisters back home, she describes how Palm Sunday was celebrated in Jerusalem:
As the eleventh hour approaches, the passage from the Gospel is read, where the children, carrying branches and palms, met the Lord, saying; Blessed is He that cometh in the name of the Lord, and the bishop immediately rises, and all the people with him, and they all go on foot from the top of the Mount of Olives, all the people going before him with hymns and antiphons, answering one to another: Blessed is He that cometh in the name of the Lord.
And all the children in the neighbourhood, even those who are too young to walk, are carried by their parents on their shoulders, all of them bearing branches, some of palms and some of olives, and thus the bishop is escorted in the same manner as the Lord was of old.
This ancient practice, we continue today, in union with our brothers and sisters in the Holy Land, and throughout the world.