Lagos Tragedy

The Tragedy of Lagos (ひげき の らご, Higeki no Lagos), as it is formally known, was a disastrous turn of events about 110 years ago for the House of Vista that claimed the lives of some two dozen people at the family summer home, Lagos. The tragedy viciously wiped out two paternal lines of the Vista lineage and humiliated the family in its' wake. Most notably amongst the fallen were Ōzato Vista, heir to the family, Gregorio Vista, his youngest brother, and Captain Xavier, best friend of Ōzato—their wives, children, and a dozen servants perished with them that day. That day, the Vista's numbers were cut down greatly. This left Sanjo Vista's great-great-grandfather, the second born after Ōzato, to take over the family in coming years. The entire catastrophe was caused by the eldest son of Ōzato, who's secret meddling in the Black Arts ended in bloodshed. He was the sole survivor, and in following days, the first Vista to be executed by hanging. While mourning swept the Kingdom of Fiore, some wondered if the heavens had turned away from the Vista and dealt them their just deserts. However, there are facts to the matter that are lost in history.

Ramifications
The consequences of this loss were more far reaching than most realize. Among the most obvious things, the Vista family was chopped down numerous notches in size alone. With the existing line's propensity to have few children and more daughters, those that are Vista in blood and name are few in number. Yet, above all this, it showed that the Vista could be hurt and left to do nothing in defense as they had hurt themselves. It showed weakness and further humiliated them as their one of their very own had fallen into the twisted world of the dark arts. It is not a subject often touched on among family or friends. The catastrophe resulted in the extinction of two paternal lines of the family, robbing the family of its' primary and third heirs along with their children.

Trivia

 * The concept is inspired by the Summerhall tragedy in the A Song of Ice and Fire book saga.
 * Special thanks to users: Phantombeast, Flame Lizard, etc for helping me iron out some details for this event. If I failed to cite your name in the list, it's due to my memory failing me on this.
 * The tragedy serves as a prime explanation to the small size of Sanjo's family in the current era.