With Tecteun, they became a self appointed ruling elite. And Tecteun proposed that they gene splice the ability to regenerate into future generations of Citadel dwellers. It would become the genetic inheritance of them and their descendants. But he would restrict the regenerative process to a maximum of twelve times. The Timeless Child became the base genetic code for all Gallifreyans within the Citadel. The civilisation which renamed themselves, with characteristic pomposity, Time Lords. The...