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Sidir XVIII was the son of Empress Alia VII and brother of Saurophon and Avelard IX.

He succeeded his mother to the Imperial Chair and his brother Saurophon succeeded to the Duchy.

He himself was succeeded by his brother, Avelard IX.

Preceded by
Fredhrick II and Alia VII
Padishah Emperor of the Known Universe
7519 AG - 7537 AG
Succeeded by
Avelard IX