There was the development of Feudalism, The Crusades, The Magna Carta, The Hundred Years' War, The Black Death, and the disagreements between Popes and Kings.
In 1753, however, the Marriage Act, promoted by the Lord Chancellor, Lord Hardwicke, declared that all marriage ceremonies must be conducted by a minister in a parish church or chapel of the Church of England to be legally binding.
No defending the Defense of Marriage Act. In 1996, as a freshman member of the House of Representatives, I wrote the Defense of Marriage Act, better known by its shorthand acronym, DOMA, than its legal title. The law has been a flash-point for those arguing for or against same-sex marriage ever since President Clinton signed it into law.