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 1967 Supreme Court decision on Loving v. Virginia made American a nti-miscegenation laws unconstitutional. Until that point, 16 states, all in the South (see below) had laws banning mixed 'race' marriages. Note also, however, that many other states had only recently overturned their laws.