Alexios III Angelos vs Huascar

Alexios III Angelos overthrew his brother Isaac II in a palace coup, blinding and imprisoning him. Alexios III then ruled as emperor, but his reign was marked by corruption, fiscal mismanagement, and the weakening of Byzantine defenses.

When the Fourth Crusade besieged Constantinople in 1203, Alexios III fled the city with the imperial treasury, abandoning his subjects. His cowardly flight left the capital defenseless and allowed the crusaders to restore Isaac II and Alexios IV, but also set the stage for the eventual sack of Constantinople in 1204.

Alexios III was captured by Theodore I Laskaris, the Nicaean emperor, after attempting to regain power with Seljuk support. He was imprisoned in a monastery in Nicaea, where he died later that year, ending his attempts to reclaim the Byzantine throne.

After the death of their father Huayna Capac, Huascar and his half-brother Atahualpa fought a civil war for control of the Inca Empire. Huascar initially held the southern capital Cusco, but Atahualpa's northern forces defeated him after years of conflict.

Atahualpa's generals Quizquiz and Chalcuchimac defeated Huascar's army at the Battle of Quipaipan near Cusco. Huascar was captured and imprisoned, effectively ending his rule and leaving Atahualpa as the sole Inca emperor.

After his capture, Huascar was executed on the orders of Atahualpa, who feared a rebellion. The execution occurred while Atahualpa himself was imprisoned by Spanish conquistadors at Cajamarca, weakening Inca resistance to the Spanish.