From Wikipedia

This feast is called in Greek Ὕψωσις τοῦ Τιμίου καὶ Ζωοποιοῦ Σταυροῦ[1] (Raising Aloft of the Precious and Life-Giving Cross) and in Latin Exaltatio Sanctae Crucis. In English, it is called The Exaltation of the Holy Cross in the official translation of the Roman Missal, while the 1973 translation called it The Triumph of the Cross. In some parts of the Anglican Communion the feast is called Holy Cross Day, a name also used by Lutherans. The celebration is also sometimes called Feast of the Glorious Cross.[2]

According to legends that spread widely, the True Cross was discovered in 326 by Saint Helena, the mother of the Roman Emperor Constantine the Great, during a pilgrimage she made to Jerusalem. The Church of the Holy Sepulchre was then built at the site of the discovery, by order of Helena and Constantine. The church was dedicated nine years later, with a portion of the cross[3] placed inside it. Other legends explain that in 614, that portion of the cross was carried away from the church by the Persians, and remained missing until it was recaptured by the Byzantine Emperor Heraclius in 628. Initially taken to Constantinople, the cross was returned to the church the following year.

The date of the feast marks the dedication of the Church of the Holy Sepulchre in 335. This was a two-day festival: although the actual consecration of the church was on September 13, the cross itself was brought outside the church on September 14 so that the clergy and faithful could pray before the True Cross, and all could come forward to venerate it.

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