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With a PoD of Alexios I's ascension to the throne in 1081, your challenge is to make the Komnenmoi dynasty remembered largely as a string of inept failures, while the Angeloi dynasty as energetic and capable.

Due to butterflies, of course, the Angeloi aren't going to show up in the same way, so the secondary challenge is ensuring that the descendants of the commander of the Byzantine fleet in Sicily in 1081 still find their way onto the throne.
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