St. Jerome (Latin: Eusebius Sophronius Hieronymus) was a Christian Saint and Scholar. He was well known for his commentaries on the Gospels and translating parts of the Bible into Latin (the translation that became known as the Vulgate) in additon to an extensive list of writings.
Therefore, it is only natural that St. Jerome is considered the patron saint of translators.
The anniversary of his death on September 30th 420 is nowadays celebrated as International Translation day. A day which was created to remind people of the importance of translations in our increasingly globalised world.
Here you can find some more information on international translation day.