As we are reading Allan Massie's novel, Tiberius: The Memoirs of the Emperor, it might be worthwhile to look at modern biographies of Tiberius.
These I have in my library:
G.P. Baker: Tiberius Caesar, Emperor of Rome (1929)
Robin Seager: Tiberius (1972, revised edition 2005)
Barbara Levick: Tiberius the Politician (1976, revised edition 1999)
More on these later, I'm reading the Baker right now … comments are invited.
And Google Books has this oddity:
The history of that inimitable monarch Tiberius by John Rendle (1813)
WHO, IN THE XIV YEAR OF HIS REIGN,
REQUESTED THE SENATE TO PERMIT THE WORSHIP OF JESUS CHRIST
AND WHO, IN THE XVI AND THREE FOLLOWING YEARS,
Or,
BEFORE THE CONVERSION OF CORNELIUS BY PETER,
SUPPRESSED ALL OPPOSITION TO IT.
The Rev. JOHN RENDLE, M. A.