The new parliament , called Dáil Éireann ( meaning `` Assembly of Ireland '' , see First Dáil ) met in the Mansion House , Dublin in January 1919 .
That new parliament , called Dáil Éireann ( meaning `` Assembly of Ireland '' ) met in the Mansion House , Dublin in January 1919 , although De Valera and leading Sinn Féin MPs had been arrested .