The source I found was published so it must be somewhat true, At least that's what I believe.
This is what the book is called

Enciclopedia de Navarra. Tomo IV. pp. 403-404 ESPARZA

Here is a small part of it in transalation

ESPARZA, Lineage - The first mention of this lineage (stock) goes back to 1046 when Garcia de Esparza, 1st lord of Esparza and Escaroz, made a donation to Leyre and to the bishop Don Sancho of the monastery erected at Escaroz.
Belonging to or having relationship with the line: Lope de Esparza, who in 1238 left
Navarra to fight in the conquest of Valencia (against the Moors) together with Jaime I (F!
Conquistador). As a reward he received from Jaime the place Benafar (in the province of
Valencia). Monseñor Rodrigo de Esparza, chamberlain (camerlango) of Carlos III deceased in
1423; and captain Ramón de Esparza, Lord of Esparza, Artieda, Vesoya y Escaroz, Almirante of
the valley of Salazar and Aalmiradío de Navascués, which he received from monarchs Juan and
Catalina (of Navarra) from the property of Orazeati in 1497.
At the beginning of the XVI century there came the linkage of the lineages of Esparza and Elio by the marriage of Ana de Esparza, likewise, Lady of Esparza, Artieda, Vesoya, Escaroz, Ugarrón y Guerendiáin, with Luis de Elio y Goñí, Lord of Elío. who died in 1525 in the battle of Pavía, serving Carlos I.
Gaspar Piñeiro de Elío, Esparza y Artieda, served Felipe IV, Carlos II, was master of the field of the Tercios@ de Navarra and as a result wounded in Fuenterrabía. In 1689, in the edition of the Anales@ (annals) of Padre Moret, is read the approval of the work done by José Piñeiro de Elío, master of the field of the Spanish infantry.
The offspring of the lineage remained in the village, appear frequently among its principals, especially in reference to the Lord of the Apa1acio de Cabo de armería de Esparza@, (literally,palace at the end of the armory (gunsmith) of Esparza). Lope Sanz de Fsparza was alcalde (mayor) of the valley in 1125; in 1488, Lope de Esparza was a noble exempt of any payment of the cuarteles (barracks). an exemption granted the palace of Esparza in 1429; in 1599, Lope de Fsparza y Artieda appears as a perpetual Almirante of the Valley of Salazar and the almiradio de Navascués; another Lope de Esparza appeared before, in 1537, as beneficiary of an Acostamiento of 50,000 maravedises for services rendered to the crown in Italy, Flanders and Portugal; he was the brother of Francisco de Esparza y Artieda, lieutenant of the castle of San Telmo in Naples. JAG