The Origins of the Gospel of Luke

The Gospel of Luke was probably written about 50 years after Jesus' death or so sometime in the 80s. The vast majority of our hundreds of copies of Luke come from the later Middle Ages. We don't have a copy of Luke and it's not a complete copy, but the earliest relatively, like, has big chunks of it is from around the year 200. So many centuries after Luke, one of the many tasks scholars have is trying to figure out how we know what Luke wrote because readers read things other than Luke wrote. It's interesting to know what readers read throughout history.