That new parliament , called DÃ il Ã ireann ( meaning `` Assembly of Ireland '' ) met in the Mansion House , Dublin in January 1919 , although De Valera and leading Sinn FÃ in MPs had been arrested . That new parliament , called DÃ il Ã ireann ( meaning `` Assembly of Ireland '' , see First DÃ il ) met in the Mansion House , Dublin in January 1919 , although De Valera and leading Sinn FÃ in MPs had been arrested .