"Mother, it's been so long..."
Margot to Catherine de' Medici in All It Cost Her Edit
Princess Margaret of Valois, also known as Margot, is the daughter of Catherine de' Medici and Henry II. She is the younger half-sister of Clarissa and Sebastian, the younger sister of Francis, Louis, Elisabeth and Claude as well as the older sister of Henrietta, Emone, Charles and Henry III. She is portrayed by Rebecca Liddiard.
Catherine is irritated by the menu as prawns are being served. She mentions her youngest daughter (Margaret) is allergic to them and can't eat prawns.
In Terror of the Faithful, Bash is having a conversation with Catherine. She shows him her bible, which contains all of her childrens names, including Margaret. Seconds after, Catherine tells Bash she loves all her children, even the ones who didn't survive. She names Louis, Henrietta and Emone as the children who died during childhood, meaning Margaret is still alive.
In this episode, Claude mentions how her mother loves her other sisters more then her. Since she says sisters it is most likely she means Elisabeth and Margaret, since Claude doesn't have any other living sisters.
After getting advice from Emanuelle who saw the future of France. Catherine visits her youngest daughter Margot (Margaret) after years. Margot is suprised to see her mother after so long. Catherine invites her to return home, saying she is needed by her mother.