Raphael, Pope Leo I - Attila Stanza di Eliodoro, Vatican

Pope Celestine I (428), Epistolae Nullus invitis detur episcopus. Cleri plebis et ordinis consensus et desiderium requiratur.  PL 67.276D Gratian, Decretum =D.61 c.13 and in 59 Pre-Gratian Collections Pope Leo I (440-461), Epistolae 10.6: Dilectissimis fratribus universis episcopis per Viennensem provinciam constitutis:   Qui praefuturus est omnibus ab omnibus eligatur.  PL 54.634A   Gratian, Decretum = (—) and in no early canonical collection Pseudo-Isidore Anicitus, Bonorum operum and De ordinationibus (JL †57), Ipse qui illis omnibus preesse debet, ut ab omnibus illis eligatur et ordinetur.  ed. Hinschius p. 120  Gratian, Decretum = (—); Burchard of Worms 1.28, Ivo of Chartres, Decretum 5.139 Tripartita 9.1 and 9 pre-Gratian Collections Peter Norton, Episcopal Elections 250-600: Hierarchy and Popular Will in Late Antiquity (Oxford Classical Monographs; Oxford 2007) 43-44.