john trousbutt , the rector in 1230 , added aisles to the interior and in 1585 the parish joined with that of st gregory 's in barker lane to form the present 'small parish ' , which , according to a battered , moss-dotted metal plaque screwed to the gate , 'has contributed an archbishop ( of armagh ) , 25 sheriffs , 28 lord mayors , 3 county sheriffs & 3 mps for the city ' .