Ambrosiaster or Pseudo-Ambrose is the name given to the unknown author of a commentary on the epistles of Saint Paul, written some time between 366 and 384 AD. This commentary was erroneously attributed for a long time to St. Ambrose, hence the name "Ambrosiaster" (literally in Latin: "would-be Ambrose"). Various conjectures have been made as to Ambrosiaster's true identity, and several other works have been attributed to the same author, with varying degrees of certainty.