Question: Cearl is the first Mercian king mentioned by which English monk at the monastery of St. Peter and its companion monastery of St. Paul in the Kingdom of Northumbria of the Angles?

Context paragraphs:
St. Peter's Church, Mainz: St. Peter's Church (in German Peterskirche) is located beneath Deutschhaus Mainz in the northwest of the historical center of Mainz, Germany.  It is the one of the most important rococo buildings in Mainz.  Originally it was a collegiate church monastery of ″St. Peter before the walls″, which had existed since the 10th century and is dedicated to the apostle Peter as patron.  Today it serves as a parish church for the parish of St. Peter / St. Emmeran.

Bede: Bede ( ; Old English: "Bǣda" or "Bēda" ; 672/3 – 26 May 735), also known as Saint Bede, Venerable Bede, and Bede the Venerable (Latin: "Bēda Venerābilis" ), was an English monk at the monastery of St. Peter and its companion monastery of St. Paul in the Kingdom of Northumbria of the Angles (contemporarily Monkwearmouth–Jarrow Abbey in Tyne and Wear, England).  He is well known as an author and scholar, and his most famous work, "Ecclesiastical History of the English People" gained him the title "The Father of English History".

Mount Saviour Monastery: Mount Saviour Monastery is a historic farm and monastery campus and national historic district located near Pine City, Chemung County, New York.  It encompasses 10 contributing buildings and 3 contributing sites on a working farm in continuous operation since 1865.  The monastery was founded in 1950 and the property is owned by the Benedictine Foundation of New York State.  Located on the property are the contributing Our Lady Queen of Peace Chapel (1953) and East and West Buildings (1964), St. Joseph’s House (1954-1957), St. Peter’s House (Former Nagel/Hofbauer House, 1874), St. Gertrude’s House (Former Durmstadt House, 1865), Mount Saviour Monastic Cemetery (1960), Good Shepherd Lay Cemetery (1955), St. Peter’s Barn (Former Nagel/Hofbauer Barn, c.1890/1942), Main barn (1959), Arts & Crafts Building & Storage (Former Shop Building and Kiln, 1962/1973), Wagner House (Former Neilitz House, 1879), St. James’s House (Former Harding House, 1870), and Annex (Former milk house and now monastery guest house, 1870/1961).

Abbey of Saint Peter in the Black Forest: St Peter's Abbey in the Black Forest or St. Peter's Abbey, Schwarzwald (German: "Kloster St. Peter auf dem Schwarzwald" ) is a former Benedictine monastery in the village of St. Peter im Schwarzwald, in the district of Breisgau-Hochschwarzwald, Baden-Württemberg, Germany.

Cearl of Mercia: Cearl (or Ceorl) was an early king of Mercia who ruled during the early part of the 7th century, until about 626.  He is the first Mercian king mentioned by Bede in his "Historia ecclesiastica gentis Anglorum".  Bede was a Northumbrian who was hostile to Mercia, and historian Robin Fleming speculates that as "ceorl" means "rustic" in Old English, his name may have been a joke.

Santa Maria, Àneu: Santa Maria d'Àneu is a Benedictine monastery in La Guingueta d'Àneu, Pallars Sobirà, Catalonia, Spain.  It is known for its apse, originally painted at the church and later transferred to the Museu Nacional d'Art de Catalunya.  The Romanesque monastery was documented in the year 839 in the records associated with the consecration of the Cathedral of Santa Maria d'Urgell.  It is believed that it was originally a Visigoth monastery dedicated to St. Deodata.  Until the late 10th century, it was dedicated to St. Peter.  In the 11th century, it became a Benedictine monastery but in 1216, it was transferred to the Augustinians.  By 1723, after a gradual decline, it had only one prior and a lay brother.  Becoming part of the deanery of Anheu, it served as a pilgrimage center for the entire region.  During the Spanish Civil War in 1936, it was burned and later replaced by a replica.  The sanctuary is dedicated to the Mare d'Àneu.

St. Peter's Church, Tiberias: The St. Peter's Church (Hebrew: כנסיית פטרוס הקדוש‎ ‎ Latin: "Ecclesia Sancti Petri" ) is the name given to a religious building belonging to the Catholic Church which is next to a monastery in Tiberias, a town on the western shore of the Sea of Galilee, in the Lower Galilee, in northern District of Israel.  The church is named after St. Peter one of the apostles of Jesus, because it is near where Catholics believe that St. Peter was a fisherman in Galilee.

Coptic monasticism: Coptic Monasticism is claimed to be the original form of Monasticism as St. Anthony of Egypt became the first one to be called "monk" (Gr: μοναχός) and he was the first to established a Christian monastery which is now known as the Monastery of Saint Anthony in the Red Sea area.  St. Anthony's Monastery (also known as the Monastery of "Abba Antonious") is now the oldest monastery in the world.

St. Paul's Church (New Melle, Missouri): St. Paul's Church, also known as St. Paul's Lutheran Church and Day School and St. Peter's Lutheran, is a historic Lutheran church located at New Melle, St. Charles County, Missouri.  It was built in 1860 by A. Carl Schlottmann and is a one-story rectangular limestone rubble block building on a limestone rubble foundation.  It features a projecting bell tower added in 1881.  St. Paul's Lutheran Church was founded by German immigrants in 1844 and was the first Lutheran Church in St. Charles County.

Sant Pere de les Maleses: Sant Pere de les Maleses is a Benedictine cave monastery in the municipality of La Pobla de Segur, Pallars Jussà, in the Province of Lleida, Catalonia, Spain.  the monastery was first mentioned in 868 when it was dedicated to St. Andrew and was donated to St. Vincent of Oveix, the abbot of Attila.  During the tenth or eleventh century it ceased to be owned by Oveix and was rededicated to St. Peter.  It later fell under ownership of Santa Maria de Gerri, and lost its status as a monastery.  It was secularized in 1592 and from then on became a simple church.

Supporting paragraphs: Cearl of Mercia Bede
Answer: Bede