Decade of Centenaries timelineBallytrain RIC barracks captured and sacked by the IRA. photograph, 1920
National Museums IrelandThe last letter written by Seán Mac Diarmada (Sean MacDermott) letter, 11 May 1916
Bodleian Library blog 100 years ago: Constitutional Crisis and the Parliament Act of 1911 open_in_new article, 2011