Meskel (መስቀል) or the finding of the true cross
Meskel is an annual religious holiday in the Ethiopian and Eritrean Orthodox churches. Meskel means cross, and the origin of this festival goes back to the 4th-century AD. It commemorates the Helena’s day, the Roman Empress, when she discovered the true cross on which Christ was crucified.
Shortly after the crucifixion of Jesus, his followers used the true cross to perform great miracles, like rising the dead. Seeing this, non-Christians stole and buried the cross in 34 AD, declaring the site of burial to be an area of waste disposal. After its theft, the true cross was lost for three centuries.
Meskel is celebrated on the 17 Meskerem in the Ethiopian calendar, which is the September 27 in the Gregorian calendar, or September 28 in leap years.