Thanks for that suggestion, Brennus!
I absolutely agree about Holland's writing skill ("Persian Fire" is a very fine read indeed) and therefore have to look out for those other two books.
Just finished reading "Die Merowinger und das Frankenreich" ("The Merovingians and the Frankish Empire") and need new books again.
(Have to cover about 2 hours everyday driving to/from work by train so there is quite some time to read...)