User blog comment:The Dragon Demands/The History of House Targaryen. Part IV: The Dance of the Dragons/@comment-5014364-20131202200013

I didn't understand this before: Volantis is commonly thought of as "the Triarchy", but there was a separate Triarchy 170 years ago:

Through some sort of complex marriage alliances, Tyrosh, Lys, and Myr had united into a single large state spanning across the peninsula of the Disputed Lands -- they called it the "Kingdom of the Three Daughters" and it was apparently ruled by a Triarchy, one for each state. Prince Daemon is mentioned as engaging in frequent military campaigns in the Stepstones....apparently the Triarchy were his archenemy who he was constantly fighting.

The idea I get is that this three-way alliance drastically altered the regional balance of power, and suddenly the strong "Kingdom of the Three Daughters" was expanding in all directions - and by expanding into the Stepstones (right next to Tyrosh), they threatened Targaryen interests in Westeros.

I'm shocked that Lys and Myr were able to set aside their differences like this -- or did the Lys/Myr feud only begin *after* the eventual breakup of the Triarchy?