1282: The Battle of Orewin Bridge is fought. After Edward I had conquered much of Wales in the 1270s, tensions had grown between the remnant and England over the following years. In 1282, Llewellyn ap Gruffudd declared war on England on behalf of all Welshmen. At Orewin Bridge, he was killed, effectively ending the independence of Wales as it was absorbed into England.
1931: The Statute of Westminster is passed, giving full legislative independence to the Dominions within the British Empire. Australia, New Zealand, Newfoundland, Ireland, Canada, and South Africa became effectively self-governing states within the British Empire with this momentous Parliamentary Act. Although the Head of State would remain the British Crown, and the Heads of Government were still technically subordinate to the crown, the Statute of Westminster established the situation which exists today in which all the one time Dominions became de facto independent.