One reference to Angelica and an incident in the Orlando Furioso occur in the Satyres, and from the same source as well as from an unpublished letter we learn that he had read Dante.
He refers to him in the fourth Satyre ('who dreamt he saw hell'), and in an unpublished letter in the Burley MS.
In an unpublished letter of the times, I find a cause in the Star-chamber respecting a play being acted at Christmas, 1614, at the house of Sir John Yorke; the consequences of which were heavy fines and imprisonment.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "unpublished letter" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.