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.
The rapid rise of legal same-sex marriage. Most of the states where same-sex marriage is legal came after the Supreme Court overturned a key portion of the Defense of Marriage Act in 2013. Judges across the country decided the reasoning of the ruling meant that state bans on gay marriage were unconstitutional.