The first recorded data concerning the phenomenon of the "honeymoon' is found among the early writings of the Northern European countries. newly married couples were required - actually compelled - to drink from one full moon to the next full moon (about 30 days), a wine derived from fermented honey and water and called metheglin.
It was believed that a thirty day diet of metheglin furnished newlyweds with sufficient sweetness to carry out their marriage vows forever. Some of the newlyweds took their metheglin intake so seriously that they perished from it.
That was the fate of Attila, the great warrior, who imbibed so much honey at his wedding feast that he drank himself to death.