There are 3 books in The Roman Britain Trilogy series.
The Roman Britain Trilogy series does not have a new book coming out soon. The latest book, The Lantern Bearers (Book 3), was published in February 1959.
The first book in The Roman Britain Trilogy series, The Eagle of the Ninth // Eagle, was published in November 1954.
The Roman Britain Trilogy series primarily falls into the General Fiction genre.