The Evolution of the Ius commune

Justinian's Corpus iuris civilis  (Digest, Code, Institutes)

Codex Florentinus

Pepo (1075)
Irnerius
The Four Doctors of Roman Law (Jacobus, Martinus, Bulgarus, and Hugo)
Azo and Accursius (Ordinary Gloss on the Corpus iuris civilis)
 

Last Judgment Tympanum --- St Foy, Conques, France 1050-1120

Canon Law

Gregorian Revolution (Investiture Controversy)

Pope Gregory VII (1073-1085)

Libertas ecclesiae (Liberty of the Church)

Church and State

Sources of Canon Law

Conciliar Canons (local and general)
Papal Decretals (letters)
Church Fathers
Custom

Gratian, Concordia discordantium canonum = Decretum
Huguccio, Johannes Teutonicus (Ordinary Gloss), Innocent IV, Hostiensis

Doctor utriusque iuris