What did ST Andrew do after Pentecost?

After Pentecost, St. Andrew is traditionally believed to have traveled to spread the teachings of Jesus Christ, primarily in regions such as Greece and Asia Minor. He is often associated with missionary work, preaching the Gospel and converting people to Christianity. According to tradition, he eventually met martyrdom in Patras, Greece, where he was crucified on an X-shaped cross, known as the Saltire. His efforts in spreading Christianity made him a significant figure in the early church.