On the 24th April 1916, SMS Seydlitz was part of the German fleet that sailed from Germany to bombard the east coast of England as part of the German commitment to the leaders of the Easter Rising in Ireland.
It hit a mine several hours after sailing with the loss of 12 crew and was forced to return to port.
It was repaired and later took part in the Battle of Jutland.
The list of those killed in the Easter Rising raid and at Jutland can be found on the following site :
http://www.denkmalprojekt.org/2016/kaiserl-marine-sm-grosser-kreuzer-seydlitz-wk1.html