Question: Which Saint, known as the "Apostle of the Apostles," was credited for two epistles in the Bible? 
Sentence (from "Authorship of the Petrine epistles"): The authorship of the Petrine epistles (First and Second Peter) is an important question in biblical criticism, parallel to that of the authorship of the Pauline epistles, since scholars have long sought to determine who were the exact authors of the New Testament letters.
Relevant evidence: No