Need the the history of the struggle between church and state from Constantine t

Question: Need the the history of the struggle between church and state from Constantine to the Investiture contest!?

Sources: Eusebius, Life of Constantine; the opening of the Corpus Iuris Civilis; Einhards Life of Charlemagne; Gelasius on The Two Sword; and the letters of Pope Gregory VII and Emperor Henry IVWww@QuestionHome@Com

Best Answer - Chosen by Asker:

Eusebius, Life of Constantine
http://www!.fordham!.edu/halsall/basis/vit!.!.!.

Corpus Iuris Civilis
http://www!.fordham!.edu/halsall/source/co!.!.!.

Einhards Life of Charlemagne- http://www!.fordham!.edu/halsall/basis/ein!.!.!.

Gelasius on The Two Sword
http://www!.fordham!.edu/halsall/source/ge!.!.!.

Pope Gregory VII and Emperor Henry IV
http://www!.fordham!.edu/halsall/source/he!.!.!.

http://www!.fordham!.edu/halsall/source/g7!.!.!.Www@QuestionHome@Com