You've found the home of Thomas Harlan's OATH
OF EMPIRE series from Tor Books,
which includes The
Shadow of Ararat, The
Gate of Fire, The Storm
of Heaven and The
Dark Lord.
And The Time of the Sixth Sun,
which is a science-fiction / archaeological-mystery/ space warfare epic set in
a far-future dominated by the Méxica (Aztec) Empire, which currently
includes Wasteland of Flint,
House of Reeds and Land of
the Dead. This series is also
published by Tor Books.
And... Crusader
Earth, which is a D20-system role-playing universe set on historical
Earth in the 1100's, mostly centered in the Holy Land and Nabatea. Most
of the components of this universe have been published in DRAGON and
DUNGEON magazines, published by
Paizo Publishing.