Theobald II (French: Thibaud or Thibault, Spanish: Teobaldo; c. 1239 – December 4, 1270), called the Young, was Count of Champagne and Brie (as Theobald V) and King of Navarre from 1253 until his death.
Theobald was the eldest son of Theobald I of Navarre and his third wife, Margaret of Bourbon. He succeeded to his father's titles on his death at only fourteen years of age. His mother acted as regent with James I of Aragon until 1256, when Theobald came of age. On 27 November, he affirmed the Fueros of Navarre, which limited his power by putting him under the counsel of a tutor from among the aristocracy. He could not make judgements without a council of twelve (a jury) of noblemen. Theobald was not content, however, to be so restricted in royal prerogative before his twenty-first birthday. He received the rites of unction and coronation from Pope Alexander IV in 1257 and 1259 respectively and tried to justify his divine right to rule, a concept foreign until that point in Navarrese politics.
In order to counter the tendency to decentralisation, diminish the power of the nobility, and evade the control of the fueros on him, Theobald turned to the bourgeoisie. He exacted extraordinary taxes and imposts from them, but they supported him nevertheless because he granted them rights, prestige, and political clout. He extended the fueros of Pamplona to Lantz and Estella to Tiebas—nowadays in ruins and depopulated—and Torralba Del Río. He founded Espinal (Aurizberri, near Roncesvalles) in 1269.