3 surviving letters between Baebius Hispanus and Pliny the Younger, spanning 100-104 AD.
My comrade Tranquillus wishes to buy a bit of land which your friend is said to be offering for sale.
I was delighted to find that you are so zealous a student of my uncle's books that you would like to possess copies...
You say that Robustus, a Roman knight of distinction, travelled as far as Ocriculum in the company of my friend...