Apparently, he unilaterally sentenced the leaders of the Easter Uprising without abiding by the measures drawn up by DORA (Defence of the Realm Act), and as everyone knows, it was the executions that turned the Nationalists the idea of a British Monarch on the Irish throne.
As I am interested in doing a TL with this as one of the PODs, I'm wondering, had Asquith found out what he was doing before it was too late, how would that change Irish History.