Tecteun
According to secret information found by the Spy Master in the depths of the Matrix, Tecteun was a Shobogan and one of the first inhabitants of Gallifrey to explore other planets. After becoming the adoptive parent of the Timeless Child, a mysterious being who eventually became the Doctor, she extracted the regeneration code from her child, splicing it into her own body and into other Shobogans'. In the process, Tecteun regenerated into a male incarnation and became one of the Founding Fathers of Gallifrey.
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