Marriage. After that it is probably rolling dem bones. I think “dice” of a type are about the oldest implements for divining luck and divining luck was the oldest form of gambling. In archeological digs, the ankle bones of ancient sheep have been found with all sorts of designs on them. Primitive people would roll those bones or throw them and ask the gods questions and depending on which symbols came up, that would be the answer to the question. By the way, some of those same primitive people can also be found at modern craps tables today.