Theobald II of Navarre

Theobald II (6/7 December 1239 – 4/5 December 1270) was King of Navarre and also, as Theobald V, Count of Champagne and Brie, from 1253 until his death. He was the son and successor of Theobald I and the second Navarrese monarch of the House of Blois. After he died childless, the throne of Navarre passed to his younger brother, Henry I.

Source: Wikipedia — https://en.wikipedia.org/wiki/Theobald_II_of_Navarre