[Elsie]

Luke was a doctor so likely knew how to write.

Ya think??

Luke 1

1 Many have undertaken to draw up an account of the things that have been fulfilled among us, 2 just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. 3 With this in mind, since I myself have carefully investigated everything from the beginning, I too decided to write an orderly account for you, most excellent Theophilus, 4 so that you may know the certainty of the things you have been taught.

[Lee N. Field]

Don't forget also, Jesus came to the synagogue at Capernaum, and was given the scroll of the book of Isaiah, for him to read from.

I think a lot more people were literate in the Roman world, that many people assume.