What is the St Andrew’s cross?

Answer: Historical evidence for the shape of the St Andrew’s cross, i.e. a cross in the shape of the Greek letter X, does not exist prior to the 13th century. The martyrdom, i.e. the story of the martyrdom of St Andrew, as described in one of the books of the apocrypha dating back to the 3rd century, describes the death of St Andrew through crucifixion without mentioning the St. Andrew’s cross.