FTP, name this council held in 1869 and 1870, in which Pius IX asserted the doctrine of papal infallibility.
Conrad Martin of Paderborn was charged with revising its constitution, whose first draft was largely the work of Johann Franzelin.  Cardinal Gibbons was the youngest member of the delegation, which in the third of its four sessions produced the canons "On God the Creator of All Things," "On Revelation," "On Faith," and "On Faith and Reason," comprising the Dogmatic Constitution of the Catholic Faith.  This council had its roots in the publication of the Syllabus of Errors five years earlier and sought to address the issue of rationalism.  Called forth in the bull Aeterni Patris and discussing the "teaching authority of the Roman pontiff" in its final session, it was cut short by the outbreak of the Franco-Prussian War.  FTP, name this council held in 1869 and 1870, in which Pius IX asserted the doctrine of papal infallibility.
Conrad Martin of Paderborn was charged with revising its constitution, whose first draft was largely the work of Johann Franzelin.  
First Vatican Council or Vatican I (prompt on "Vatican")