Although most readers familiar with the history of Spain might know the Carlos Faction, the author will provide a simple explanation for the readers who are unfamiliar with Spanish history or the Carlos Faction. Readers who are clear about this piece of history can skip ahead.
Before Queen Isabella, Spain followed male-only succession laws, so the Carlos Faction didn't come into play.
However, Queen Isabella's father, Ferdinand VII, only had two daughters. In order to keep the throne in his family, Ferdinand temporarily revised the succession laws to grant Isabella the right to inherit.
Amending the succession laws was one thing, but Isabella was only three years old, obviously not suitable to become a king.
This caused dissatisfaction for Ferdinand VII's brother, Prince Carlos, who originally should have inherited the throne. Moreover, nobles who supported the Salic Law (male succession) banded together, declaring Prince Carlos as Carlos V, thus forming the Carlos Faction.
You can look up the subsequent Carlist Wars on your own, but they all ended in failure anyway.
In summary, the Carlos Faction was a faction within the Bourbon family competing for the throne, but it fundamentally remained a part of the Bourbon family. (Key point)
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