▁the ▁Kingdom ▁of ▁Arag on ▁on ▁the ▁road ▁south ▁from ▁Naval ▁to ▁El ▁Gr ado . ▁The ▁battle ▁was ▁a ▁minor ▁eng agement ▁of ▁the ▁on going ▁Re con qu ista ▁of ▁Arag on , ▁the ▁process ▁by ▁which ▁the ▁river ine ▁valle ys ▁of ▁the ▁southern ▁s lop es ▁of ▁the ▁Py ren ees ▁were ▁gradually ▁conquer ed ▁and ▁returned , ▁after ▁centuries ▁of ▁Muslim ▁rule , ▁to ▁the ▁control ▁of ▁Christian ▁princes . ▁The ▁r uler ▁of ▁Arag on , ▁who ▁personally ▁led ▁his ▁men ▁in ▁battle ▁at ▁P ied ra ▁P is ada , ▁San cho ▁Ram í rez , ▁also ▁ruled ▁Kingdom ▁of ▁Navar re ▁and ▁was ▁a ▁major ▁figure ▁in ▁the ▁contemporary ▁Re con qu ista . ▁ ▁The ▁battle ▁is ▁only ▁recorded ▁in ▁two ▁later ▁sources , ▁the ▁Arag on ese ▁and ▁Latin ▁versions ▁of ▁the ▁Chron icle ▁of ▁San ▁Juan ▁de ▁la ▁Pe ña . ▁The ▁former ▁says ▁that ▁" in ▁the ▁year ▁of ▁our ▁Lord ▁ 1 0 8 3 ▁... ▁[ San cho ▁Ram í rez ] ▁did ▁battle ▁in ▁P ied ra - p iss ada ▁with ▁the ▁Mo ors ▁on ▁Christmas ▁day ." ▁The ▁Latin ▁translation ▁reads : ▁" And ▁[ San cho ] ▁made ▁battle ▁before ▁Pet ram ▁P is ad am ▁with ▁the ▁Mo ors , ▁the ▁day ▁of ▁the ▁N ativity ▁in ▁the ▁year ▁of ▁our ▁Lord ▁ 1 0 8 4 ." ▁The ▁two ▁texts ▁differ ▁in ▁the ▁year , ▁and ▁neither ▁spec ifies ▁the ▁winner ▁of ▁the