THE CHRISTIAN REALMS 249Leyre is the only monastery whose foundation can be ascribed to
the Arista dynasty with any degree of certainty. If a probably ninth-
century account of the translation of the relics of the martyr saints
Nunila and Alodia be believed, it became their royal pantheon.^46
Inigo Arista, Fortun Garces and probably other members of their line
were buried there. The subsequentJimeno dynasty naturally enough
looked elsewhere, and eventually devoted itself instead to the house
of San Juan de la Pena. As the account of his time spent in the
kingdom in the letter to Bishop Wiliesind and in his Life show,
Eulogius's visit indicates the existence of other monasteries in the
region of Pam pion a in the mid ninth century and also the relative
wealth of literary texts to be found in some of them.
The only significant expansion of the kingdom during this period
occurred in the early part of the tenth century. In 918 Sancho Garces
I extended his frontiers southwards into the vicinity of Najera and
Tudela, only to be driven back by an Umayyad army under 'Abd al-
Ralpnan III in 920. Sancho and his ally Ordono II of Leon were then
defeated in battle at Valdejunquera. Typical of the frontier conflicts
of this age, this had little effect, and in 921 Sancho Garces took
Viguera and Ordono II captured Najera in 923. They were deprived
of their new conquests by the amir in the following year, and he went
on to sack Pamplona. However, in 925 Sancho Garces, without Leonese
aid, regained all of the lost territory, including Najera, and made
himself master of the Rioja Alta. This adjustment of the frontier seems
to have been accepted by the Umayyads, and no further campaigning
ensued to attempt to dislodge the Pamplonan rulers from their new
acquisition. During the regency of Queen Toda, that followed the
death of her brother-in-law King Jimeno Garces (925-932), close ties
seem to have been forged again between Pamplona and Cordoba,
with the queen putting her realm under the protection of the caliph.
No further expansion of the still diminutive realm down the Ebro
valley was attempted until the middle of the eleventh century. In
1045 Calahorra was taken and the Rioja Baja added to the kingdom.
Similarly in Aragon, Huesca was not captured until 1096. On their
western frontiers the kings of Pamplona had been subjected to the
pressure of Leonese expansion. The foundation of Burgos in 884
brought the centre of the county of Castille close to areas of interest
to the Pamplonans and, as has been seen, the Leonese kings were
campaigning in Alava in the early tenth century. These developments
may explain the shift after 925 of the centre of the kingdom from