In this episode of Polycarp's Paradigm, Catholic evangelist Eric Robinson provides the third installment of our series on saints who promoted Christian unity: St. Antony Kauleas (901), St. Hilda of Whitby (680), St. Leo I (461), Blessed Charles de Foucauld (1916), St. Catherine of Siena (1380), St. Leopold Bogdan Mandic (1942).