García Jiménez was (sub- or co-) king of a part of Pamplona in the late 9th century, son of a supposed Jimeno.
The traditional death date of García Íñiguez in 870 would have meant there was a de facto 10-year interregnum before the return of Fortún to the kingdom.
It has been suggested that García Jiménez was called 'king' due to his service as regent during this period, lasting until he was killed at Aybar (882) in a battle against the Emir of Córdoba.
However, an alternative reconstruction would make the 882 casualties identical to García Íñiguez himself, thus allowing him to survive past his son's return, in which case no interregnum existed.
There are likewise several references to a Sancho (presumably the son of García Íñiguez and younger brother of captive Fortún) being lord of Pamplona or 'king' in the 860s and 870s.