Ardo (died 720/721) was "the last of all the Visigothic kings" of Hispania

Hispania

Another theory holds that the name derives from Ezpanna, the Basque word for "border" or "edge", thus meaning the farthest area or place. Isidore of Sevilla considered Hispania derived from Hispalis....

, reigning from 713 or, more probably 714, until his death. The Visigoth kingdom was already severely reduced in area and power due to the Arab conquests of the previous three years

Umayyad conquest of Hispania

The Umayyad conquest of Hispania is the initial Islamic Ummayad Caliphate's conquest, between 711 and 718, of the Christian Visigothic Kingdom of Hispania, centered in the Iberian Peninsula, which was known to them under the Arabic name al-Andalus....

 when Ardo succeeded Achila II on the throne.

Ardo is only recorded in one Visigothic regnal list as reigning for seven years. In 716 the Arabs crossed over the Pyrenees

Pyrenees

The Pyrenees is a range of mountains in southwest Europe that forms a natural border between France and Spain...

 and invaded Narbonensis, the last province under Gothic control. Over the next three years Ardo probably defended what remained of the Visigothic kingdom and he "may have gone down fighting like his predecessor" after the Arabs took Narbonne

Narbonne

Narbonne is a commune in southern France in the Languedoc-Roussillon region. It lies from Paris in the Aude department, of which it is a sub-prefecture. Once a prosperous port, it is now located about from the shores of the Mediterranean Sea...

and before they conquered all that remained of the old kingdom.