The house stems from the elite population of City State of Old Moon
before the Crescent
eruption. After the eruption Crescent was uninhabitable and the members of the elite had to seek refuge on the other islands. The refugees spread aroud the Eastern Islands
during the winter 620 AH. Unfortunately some refugees carried the Plague of the Black Years.
The plague, combined with the volcanic winter following the eruption, devastated the Eastern Islands. The ill-fated refugees were thought to be cursed, and were driven away from many settlements. Some high-ranking refugees managed to settle on Der Fem, and remain influential over the years despite loosing their noble status.
They remained rather unnotable until Ûzeŋadise-bargwel Šiwke Gwelzuh (King)
became a leading figure in the Zeribian Revolution of Der Fem
, and later the first Vizier of the new kingdom. They took the name šiwke
'black sails' to solidify their connection to their (claimed) refugee ancestors from Moons, and thus to legitimize their claim to the noble titles.
The chaotic state of famine and plague during the The Black Years (Crescent Eruption)
makes it hard to be certain what actually happened to the refugeed nobles. The direct lineage of the King is thought to have perished soon after the eruption, but many of the less influential relatives surely survived.
Despite the general view being that the last rulers of Moons were cursed by the gods, Moons was still such an important part of the early history of the Zeribians that Šiwke is hardly the only family that is claiming to descend from them.