Palm Sunday is a Christian moveable feast that always falls on the Sunday before Easter Sunday. The feast commemorates Jesus' triumphal entry into Jerusalem, an event mentioned by all four Canonical Gospels (Mark 11:1-11, Matthew 21:1-11, Luke 19:28-44, and John 12:12-19). In many Christian churches, Palm Sunday is marked by the distribution of palm leaves (often tied into crosses) to the assembled worshipers. The difficulty of procuring palms for that day's ceremonies in unfavorable climates for palms led to the substitution of boughs of box, yew, willow or other native trees. The Sunday was often designated by the names of these trees, as Yew Sunday or by the general term Branch Sunday.