[[Image:Gregory I - Antiphonary of Hartker of Sankt Gallen.jpg|thumb|right| A dove representing the [[Holy Spirit]] sitting on [[Pope Gregory I]]'s shoulder symbolizes Divine Inspiration]]The Gregorian repertory was systematized for use in the [[Roman Rite]]. According to [[James McKinnon]], the core liturgy of the Roman Mass was compiled over a brief period in the 8th century in a project overseen by [[Chrodegang]] of [[Metz]]. Other scholars, including Andreas Pfisterer and Peter Jeffery, have argued for an earlier origin for the oldest layers of the repertory. Scholars debate whether the essentials of the melodies originated in Rome, before the 7th century, or in [[Franks|Francia]], in the 8th and early 9th centuries. Traditionalists point to evidence supporting an important role for [[Pope Gregory I|Pope Gregory the Great]] between 590 and 604, such as that presented in Heinrich Bewerunge's article in the ''Catholic Encyclopedia''.<ref>{{ws|"[[s:Catholic Encyclopedia (1913)/Gregorian chant|Gregorian chant]]" in the 1913 ''Catholic Encyclopedia''}}, article by Heinrich Bewerunge.</ref> Scholarly consensus, supported by [[Willi Apel]] and Robert Snow, asserts instead that Gregorian chant developed around 750 from a synthesis of Roman and [[Gallican chant]] commissioned by [[Carolingian]] rulers in France. During a visit to Gaul in 752–753, [[Pope Stephen II]] had celebrated [[Mass (liturgy)|Mass]] using Roman chant. According to [[Charlemagne]], his father [[Pippin the Younger|Pepin]] abolished the local [[Gallican rite]]s in favor of the Roman use, in order to strengthen ties with Rome.<ref>Apel, ''Gregorian Chant'' p. 79.</ref> In 785–786, at Charlemagne's request, [[Pope Hadrian I]] sent a papal [[sacramentary]] with Roman chants to the Carolingian court. This Roman chant was subsequently modified, influenced by local styles and Gallican chant, and later adapted into the system of eight [[musical mode|modes]]. This Frankish-Roman Carolingian chant, augmented with new chants to complete the liturgical year, became known as "Gregorian." Originally the chant was probably so named to honor the contemporary [[Pope Gregory II]],<ref>McKinnon, ''Antiquity and the Middle Ages'' p. 114.</ref> but later lore attributed the authorship of chant to his more famous predecessor Gregory the Great. Gregory was portrayed dictating plainchant inspired by a dove representing the [[Holy Spirit]], giving Gregorian chant the stamp of holy authority. Gregory's authorship is popularly accepted as fact to this day.<ref>Wilson, ''Music of the Middle Ages'' p. 13.</ref>