The first lord of Hurtreford

The splitting (or annihilisation) of the atom by Lord Rutherford in 1919.

"Hurtreford" is an anagram of 'Rutherford'. The anagram is a process by which words are reduced to their atomic constituents (letters) and then rearranged for form new words.

Dublin, in Irish: Baile Átha Cliath is 'The Town of the Ford of the Reed Hurdles'.