Hi I can help you with some info about the "Kingdom of Navarre" cause I live in Tudela (Navarra)... well, real name was "Reyno de Navarra" and the actual province of Spain is "Navarra", not that french translation.
Just a pitty it´s 1257, because one of our most renowned kings "Sancho VII el Fuerte" or "Sancho VII the Strong" [1194-1234] (brother of "Berenguela de Navarra", wife of Richard Lionheart, and putted his main/most regular residence in Tudela, where I live, instead of Pamplona) was dead this same century on 1234 leaving no legitimate heir. Despite signed with "Jaime I de Aragón" a treaty in which whenever once died leaving no legitimate heirs the other will receive the others throne without resistance, once "Sancho VII" died the people called fast to pass the throne to his nephew Teobaldo, count of Champagne and Brie as "Theobald IV" and become "Teobaldo I de Navara" [1201-1252], also known as "the troubador". With him they come some wealthy french vassals of the north of the kingdom starting the "Casa de Champaña" ("House of Champagne") receiving important charges. Signed pacts with Aragon, Castilla and England that allowed him to consolidate in the crown. "Teobaldo I" died on 1253, passing the throne to his child with the same name.
Teobaldo "el joven" ("the young") [1238-1270] was king of Navarra as "Teobaldo II de Navarra" and count of Champagne and Brie as "Theobald V". He inherited the crown of Navarra at the age of 14, under the regency of his mother, "Margarita de Borbón Dampierre", and tutelage of "Jaime I de Aragón". In 1255 he married Isabel, the 2nd daughter of "Louis IX of France". From then, "Louis IX" acted as arbitrator in the problems of Navarra. The engagement between "Berenguela" the daughter of "Alfonso X the wise" of Castilla and the son and prince heir of "Louis IX of France" [1244-1260] the King of Castilla granted (as long as he lives) acces to the ports of Fuenterrabia and San Sebastián, for exporting products of Navarra. On July of 1270, he go en the VIII Crusade with his father-in-law (Louis IX of France) to take siege on Túnez. The results were disastrous, most of the army and the french king himself died of disentery on August 25th, and Teobaldo II died in his return on December 4th.
Being historically accurate, the Coat of Arms on that time (Teobaldo II de Navarra and IV of Champagne) was a mixture of the "Chains of Navarra" and the Champagne Coat of Arms and can be seen on this
LINK and this
LINK....
...but any citizen of Navarra would preffer to see the normal red flag with the "Chains" of Navarra (firstly there were a golden "carbuncle" with some other golden spheres added and closing the design, used at the times of Teobaldo I, the chain interpretation will be lately on the XVI century):
http://es.wikipedia.org/wiki/Escudo_de_Navarra#De_bloca_a_cadenas:_Evoluci.C3.B3n_formal
I will seek information about lords of the "Reyno de Navarra" on that century... but it´ll be hard to obtain because this period were decadent times of the kingdom and I haven´t found much info about this.
BEST REGARDS