Pope St. Damasus I fought against the Arian heresy as well as fighting succesfully to preserve the primacy of the Apostolic See. With his suggestion and assistance, St. Jerome finished his Vulgate translation of the Bible. St. Damasus also worked to restore the Catacombs ... still preserved to this day.
[note: the above image of St. Damasus is from St. Peter's Basilica, a place every Catholic should visit at least once in their lifetime!]
Pope St. Damasus, you worked tirelessly for the Truth. Pray for me ... help me to always work for the Truth ... doing the good and avoiding the evil!