Hi Ken, my name is Ann O'Sullivan (nee McSweeney) and I believe that Morgan Mc Swiney is possibly my great great grandfather. I have an article about him which says that he actually returned to Cork in 1869 having only served two years of a 7 year sentence. He was pardoned by all accounts. He lived in Cork at the time of his sentence for high treason. Let me know if you feel this is of any help. I appreciate that your post is really old but I only started looking recently following a family funeral where the the information surfaced.