E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The cross is said to have been made of four sorts of wood (palm, cedar, olive, and cypress), to signify the four quarters of the globe.
Ligna crucis palma, cedrus, cupressus, oliva.
We are accustomed to consider the sign of the cross as wholly a Christian symbol, originating with the crucifixion of our Redeemer. This is quite erroneous. In ancient Carthage it was used for ornamental purposes. Runic crosses were set up by the Scandinavians as boundary marks, and were erected over the graves of kings and heroes. Cicero tells us (De Divinatione, ii. 27, and 80, 81) that the augurs staff with which they marked out the heaven was a cross. The ancient Egyptians employed the same as a sacred symbol, and we see on Greek sculptures, etc., a cake with a cross; two such buns were discovered at Herculaneum.
It was a sacred symbol among the Aztecs long before the landing of Cortes. (Malinche.) In Cozumel it was an object of worship; in Tabasco it symbolised the god of rain; in Palinque (the Palmyra of America) it is sculptured on the walls with a child held up adoring it.
The cross is not only a Christian symbol, it was also a Mexican symbol. It was one of the emblems of Quetzal coatl, as lord of the four cardinal points, and the four winds that blow therefrom.Fiske: Discovery of America, vol. ii. chap. viii. p. 250.)