Mummer's War

The Mummer's War was a civil war that took place in 407 AC, when opponents to Visaera Targaryen's rule rose in rebellion against her. It lasted several months, and ended with the deaths of both Maegor Waters and Maekar Targaryen.

The name was coined by Grand Maester Abelar, who deemed it no true uprising.

Background
The seeds of the Mummer's War were planted in the reign of King Aenar, after the death of the old king's eldest living son, Aemon Targaryen. The sudden disappearance of the heir apparent threw the succession into confusion, until Aenar named his daughter Visaera as his heir.

The act displeased many, not only due to its defiance of traditional inheritance laws but additionally because of Visaera's nature and history. Maekar Targaryen, Prince of Summerhall, was especially displeased - and left King's Landing in a rage. When Aenar died in 407AC, it wasn't long before rumours of a possible uprising began to spread.