What show made Hannah Waddingham famous before most people knew her name?

Hannah Waddingham gained widespread recognition through her role as Rebecca Welton in the Apple TV+ series Ted Lasso, which premiered in 2020. Her performance earned her an Emmy Award and introduced her to a massive global audience who had not previously been familiar with her work. Before Ted Lasso, however, she had a notable role in Game of Thrones, where she played Septa Unella, the stern nun-like figure who famously rang a bell and chanted "Shame" while escorting Cersei Lannister through her walk of atonement. That role gave her a degree of recognition among the show's enormous fanbase, even if many viewers did not immediately know her name at the time.