Lupitus of Barcelona, identified with a Christian archdeacon

Archdeacon

An archdeacon is a senior clergy position in Anglicanism, Syrian Malabar Nasrani, Chaldean Catholic, and some other Christian denominations, above that of most clergy and below a bishop. In the High Middle Ages it was the most senior diocesan position below a bishop in the Roman Catholic Church...

 called Sunifred, was an astronomer

Astronomer

An astronomer is a scientist who studies celestial bodies such as planets, stars and galaxies.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using...

 in late 10th century Barcelona

Barcelona

Barcelona is the second largest city in Spain after Madrid, and the capital of Catalonia, with a population of 1,621,537 within its administrative limits on a land area of...

, then part of the Marca Hispanica

Marca Hispanica

The Marca Hispanica , also known as Spanish March or March of Barcelona was a buffer zone beyond the province of Septimania, created by Charlemagne in 795 as a defensive barrier between the Umayyad Moors of Al-Andalus and the Frankish Kingdom....

between Islamic Al-Andalus

Al-Andalus

Al-Andalus was the Arabic name given to a nation and territorial region also commonly referred to as Moorish Iberia. The name describes parts of the Iberian Peninsula and Septimania governed by Muslims , at various times in the period between 711 and 1492, although the territorial boundaries...

 and Christian France

Western Francia

West Francia, also known as the West Frankish Kingdom or Francia Occidentalis, was a short-lived kingdom encompassing the lands of the western part of the Carolingian Empire that came under the undisputed control of Charlemagne's grandson, Charles the Bald, as a result of the Treaty of Verdun of...

 (in 985 changing from Christian back into Muslim hands by the conquest of Al-Mansur

Al-Mansur Ibn Abi Aamir

Abu Aamir Muhammad Ibn Abdullah Ibn Abi Aamir, Al-Hajib Al-Mansur , better known as Almanzor, was the de facto ruler of Muslim Al-Andalus in the late 10th to early 11th centuries. His rule marked the peak of power for Moorish Iberia.-Origins:He was born Muhammad Ibn Abi Aamir, into a noble Arab...

).

Lupitus was instrumental in the transfer of Arabic mathematics, including the astrolabe

Astrolabe

An astrolabe is an elaborate inclinometer, historically used by astronomers, navigators, and astrologers. Its many uses include locating and predicting the positions of the Sun, Moon, planets, and stars, determining local time given local latitude and longitude, surveying, triangulation, and to...

 and the Hindu-Arabic numeral system

Hindu-Arabic numeral system

The Hindu–Arabic numeral system or Hindu numeral system is a positional decimal numeral system developed between the 1st and 5th centuries by Indian mathematicians, adopted by Persian and Arab mathematicians , and spread to the western world...

 to Christian Europe. Gerbert of Aurillac in a letter of 984 asks Lupitus for a translation of an Arabic astronomical treatise, the Sententiae astrolabii.