Pope Clement I
He was recognized as a great historian and recorded many important events in his time such as the martyrdom of his predecessors and the settling of disputes among Christians.  During a time of trouble within the Christian community, Clement wrote to the church in Corinth, asking them to end their dispute with their fellow Christians, which they did.  This established the precedent of Popes being the final person to decide the rules within the Church.  He either established, or continued the practice of recording the laws and customs of the Church.