Theodor Baratheon
Theodor Baratheon is listed as one of the fifteen children of William Baratheon and Martyna Mullendore, within a family tree the show displays on screen.
His trace goes no further than that document — no line of dialogue or scene ever takes him beyond it.
Chapter 1
A name within the Umber lineage
Show only
He was born from the union of William Baratheon and Martyna Mullendore. The show places him alongside fourteen siblings — another William among them, plus Jon, Martyn, Orys, Mace, Bryte, Tommax, Brune, Gude, Lex, Lorax, Wineiri, Miriam and Argella — all listed under the same branch of the family.
That branch was never told as a story; it was written on a prop document titled Lineages and Histories of the Great Houses of the Seven Kingdoms, where the Baratheon name is noted under the entry set aside for House Umber. No character by that name exists in the A Song of Ice and Fire novels — he belongs only to that piece of the show's material.