The cross on which Jesus was crucified, known as the True Cross, was discovered in Jerusalem by St. Helena, mother of Emperor Constantine, around 326 AD. She found it at the site of Jesus' crucifixion, Golgotha (also called Calvary), which is traditionally identified as a skull-shaped hill just outside the walls of ancient Jerusalem. This site is now within the Church of the Holy Sepulchre in the Christian Quarter of Jerusalem's Old City

. The Church of the Holy Sepulchre was built on this site to commemorate Jesus' crucifixion and burial. The True Cross was venerated there and parts of it were later taken to various locations, including Rome and other churches in Italy and Spain. Today, fragments believed to be from the True Cross are held as relics in several churches around the world, but the authenticity of these relics is often debated

. In summary:

• Jesus was crucified at Golgotha (Calvary), a site just outside ancient Jerusalem's city walls.
• The True Cross was found there by St. Helena in the 4th century.
• The Church of the Holy Sepulchre in Jerusalem marks the traditional location of the crucifixion.
• Pieces of the True Cross are distributed as relics in various churches globally.