The Chronicle of Alberic de Trois-Fontaines names "Maria Guilelmi Montepessulano filia" as wife of "rege Petro Arragonum". The primary source which confirms her first marriage has not yet been identified. "Guillelmus…Montispessulani, filius quondam Mathildis ducisse" agreed the marriage of "filiam meam Mariam" and "Bernardo, comitis Convenarum" by charter dated Dec 1197, under which Marie also agreed to renounce her rights to Montpellier in favour of "Guillelmo Montispessulani patri meo, et tibi Guillelmo filio ejus et domine Agnetis, fratri meo". However, after a revolt of the citizens of Montpellier against young Guillaume [IX], Marie recovered her inheritance 15 Jun 1204. Pope Innocent III addressed the bishops of Narbonne and Comminges by bull dated 29 Dec 1201 concerning the repudiation by "comes Convenarum" of his wife "Guillelmo domino Montispesulani…filiam". In his testament dated 4 Nov 1202, her father bequeathed money to "filiæ meæ Mariæ…et comes Convenarum maritus eius".
The Crónica de San Juan de la Peña records that Pedro II King of Aragon married "la filla del noble princep Don Guillem de Montpeller…Maria, nieta del Emperador de Costantin noble". The marriage contract between "Maria filia quondam domini Montispessulani" and "Petro Regi Aragoniæ, et comiti Barchinonis" is dated 1204, and names "comes Santius…Ildefunsus comes Provinciæ frater domini regis, Guillelmus de Balcio, Hugo de Balcio frater eius, Rocelinus vicecomes et dominus Massiliæ, Guido de Cabilione…". "Maria filia quondam domini Montispessulani…Regina Aragoniæ, comitissa Barchinonis" granted Montpellier to "Petro…Regi Aragoniæ, comiti Barchinonis marito meo" by charter dated Sep 1205, witnessed by "…Domina Clementia…". Under her first testament of 1209, Marie designated the Templars as guardians of her son, Infante don Jaime de Aragon, who succeeded his father in 1213 as don Jaime I "el Conquistador" King of Aragon. Under her last testament of 1213, she designated the Pope as his guardian: the testament of "Maria regina Aragonum et domina Montispessulani" is dated 20 Apr 1213, naming "Jacobum filium Regis Aragonum et meum…duæ filiæ meæ Mathildis…et Perona" and "dominæ Clementiæ amitæ meæ".
The Thalamus de Montpellier records the death "xviii jorns dins abril" in 1213 at Rome of "madona Maria de Montpellier molher del rei dAragon". Montpellier eventually became part of the kingdom of Mallorca, and was transferred to France in 1349. 1
Marie married Vcte Raymond Geoffroy "Barral" DE MARSEILLE, son of Vcte Hugues Geoffroy DE MARSEILLE and Cécile D' AURONS. (Vcte Raymond Geoffroy "Barral" DE MARSEILLE died on 13 Dec 1192.)
Marie also married Cte Bernard IV DE COMMINGES, son of Cte Bernard III DE COMMINGES and Unknown DE TOULOUSE. (Cte Bernard IV DE COMMINGES died on 22 Feb 1225.)
Marie also married Infante don Pedro II "el Católico" DE ARAGÓN, son of Infante don Alfonso II "el Casto" DE ARAGÓN and Infanta doña Sancha DE CASTILLA, on 15 Jun 1204. (Infante don Pedro II "el Católico" DE ARAGÓN was born in 1176 in Aragón, Spain and died on 14 Sep 1213 in Battle of Muret, near Toulouse, Haute-Garonne, France.)