The Anglo-Saxon Chronicle states that (John) Mark began
his Gospel in Egypt in AD 47 - which makes great sense and adds even more
historical validity. That history, composed under Alfred, is not 100% reliable,
but in this, it seems far more accurate than the later guesses of the
theologians a millenium later, who may have well had fewer sources! These
'scholars' late date it at 64/65AD.
(Furthermore, this late-dating is a tad
suspicious considering that Mark died in AD
63.)