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#151 - The Unconquered Standard of Arkhosia.  Sure, it may have gotten lost when the empire fell, but the flag itself was never conquered!

#152 - A Dragonborn is the current favoured consort of Tiamat.

#153 - Dragonborn are "[d]eemed the choicest soldier's in Tiamat's armies".

#154 - The (unnamed) capital city of Arkhosia (a Dragonborn city, no less) ws the number one social location for metallic Dragons.  If you weren't there, you were no-one.