He was one of the early authors of the Christian church and is the author of several books of the official Christian mythology. In the Christian Bible, the letters to the Romans, Corinthians, Galatians, Thessalonians and Philippians are all believed to have been written by him. There are several other books (also letters to various congregations) which are attributed to him, but there is some debate about the actual authorship.

So, he’s kinda the OG Paul when it comes to Christian mythology.