Hello rrRobbo,
You're entitled to ramble, I often do...
Connolly and Pearse are the DART stations either side of Trinity College, where the thematic 3 word title can be found. The men both died 100 years ago.
Finally, and I hope that I wasn't rude to Gem94, I recognised that 'Common' indicated 'Non-U.' So if you take LITMUS and subtract the 'U', perhaps you are left with Lit MS, demonstrating the 2 word description. Except that the Litmus test is not merely an acid test...