Board Thread:Lore Discussion/@comment-186.215.22.127-20130215011559/@comment-3573184-20140121041141

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"Leading his forces was Hjalti Early-Beard. Hjalti was from the island kingdom of Alcaire, in High Rock, and would become Tiber Septim, the First Emperor of Tamriel." ~ The Arcturian Heresy.

"The more recently created holidays of High Rock are those like Tibedetha, "Tibers Day," celebrated every 24th of Mid Year in honor of Alcaire's most famous, son, Tiber Septim." ~ Holidays of the Iliac Bay

"The secondary reason for the lethargy of High Rock had to do with the depth of relations between the province and the Septim Empire. For the first time since the beginning of the Dynasty, an Emperor ruled Tamriel who was neither Breton nor had spent any of his childhood in High Rock." ~ The Fall of the Usurper

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While Tiber himself may not have been a Breton, he most certainly came from High Rock, and his brother, and his brother's children, were all either Bretons and also came from Highrock.