<p>John A. Costello remains the most elusive of our former Taoisigh, despite his enormous contribution to Irish history. He declared the Republic, led the country's first ever coalition government, and faced the Mother and Child Crisis.<br>A surprise choice who battled against taking the job, Costello was the Reluctant Taoiseach.<br>Historian and political correspondent David McCullagh charts the life of this fascinating man, using his personal a...