... That "tying the knot" comes from Roman ancient times when the bride would wear a girdle tied in many knots, which the groom had the 'duty' to untie.

... That the term "honeymoon" comes from the ancient custom for couples who used to marry beneath a full moon and then drink honey wine for thiry days after the wedding to foster good luck.  A month was then a 'moon', hence honeymoon.

... That the diamond engagement ring was given by medieval Italians because diamonds represented the ideal gift because their original source was the fire of love itself.

... That in ancient times, the "best man" was a warrior friend who would help the groom fight off other men and help prevent her family from finding them, as back then the groom would kidnap his bride.