| Date | | | |
| 2-Feb-1866 | | The Special Commission for the trial of Fenian Conspirators terminates. Thirty-six prisoners were convicted or pleaded guilty, three were acquitted, and in one case the jury disagreed. | |
| 9-Feb-1866 | | Fenian ammunition manufactory discovered. A man named George Clarke, who resided in Jervis street, is murdered, between the fifth and sixth locks of the Royal Canal; it is supposed on account of his having been suspected of giving information to the police in reference to the concealment of arms. | |
| 17-Feb-1866 | | An Act for the suspension of the Habeas Corpus Act in Ireland passed both Houses of Parliament, and on the same day 120 persons are arrested in Dublin. | |
| 18-Jul-1866 | | Departure of the Earl of Kimberley, Lord Lieutenant of Ireland, consequent on the resignation of Earl Russell's Administration. | |
| 20-Jul-1866 | | Arrival of the Marquess of Abercorn, K.G., Lord Lieutenant of Ireland. | |
| Nov-1866 | December | The Fenian agitation being revived by the appearance of emissaries from the United States and elsewhere, various persons are arrested under the Habeas Corpus Suspension Act; seizures of arms by the police take place ; naval and military reinforcements are promptly sent to Dublin and other parts of Ireland. These timely preparations towards the end of the year, paralyse the movement. | |
| 30-Nov-1866 | | The new parish church of St. Andrew (erected on the site of the old Round Church which was burned some years since) consecrated by the Archbishop of Dublin, in the presence of His Excellency the Lord Lieutenant and n large congregation. St. Andrew's is a beautiful building, of cruciform shape and Gothic style. | |
| 5-Mar-1867 | | party of Fenians commence a rising, and proceed to the neighbourhood of Tallaght. Upon being summoned to surrender by twelve of the constabulary force, they fired upon the police, who returned the fire, and wounded five of the insurgents. The constabulary subsequently captured 83 of the Fenian body, and the remainder, after wandering about for a short time, during very severe weather, finally dispersed. | |
| 27-Apr-1867 | | Trial of the Fenians, Burke and Doran, commences at the Special Commission. They were found guilty of high treason and sentenced to be hanged; but the sentence on Doran was commuted to penal servitude, and the sentence on Burke was ultimately commuted to penal servitude for life, | |
| 31-Oct-1867 | | Early in the morning, Constable Patrick Keena was fired at on Wellington-quay by a man (supposed to be connected with the Fenian organization) whom he attempted to stop, and who afterwards fired at Sergeant Kelly in Eustace-street. Both the policemen were severely wounded ; Keena died of his wound, in the hospital, but Sergeant Kelly recovered. | |