Editing 1054 (section)

==== Religion ====
* Spring &ndash; Pope [[Pope Leo IX|Leo IX]] sends a [[Papal legate|legatine]] mission, under Cardinal [[Humbert of Silva Candida]], to [[Constantinople]], to negotiate with Patriarch [[Michael I Cerularius]], in response to his actions concerning the church in Constantinople.<ref>Whalen, Brett Whalen (2009). ''Dominion of God: Christendom and Apocalypse in the Middle Ages'', p. 24 (Harvard University Press).</ref> Leo becomes the first pope directly to invoke the forged [[Donation of Constantine]], citing a large portion in a letter to Michael, believing it genuine.<ref>[[s::Catholic Encyclopedia (1913)/Donation of Constantine|"Donation of Constantine"]]. ''Catholic Encyclopedia''. New York: Robert Appleton Company. 1913.</ref><ref>Migne, Jacques-Paul (1891). ''[[Patrologia Latina]]''. Volume 143 (cxliii). Col. 744–769.</ref><ref>Mansi, Giovanni Domenico. ''Sacrorum Conciliorum Nova Amplissima Collectio''. Volume 19 (xix). Col. 635–656.</ref>
* [[July 16]] &ndash; [[East-West Schism]]: Humbert of Silva Candida, representative of the newly deceased Leo IX, breaks the relations between [[Latin Church|Western]] and [[Eastern Orthodoxy|Eastern Churches]], through the act of placing an invalidly-issued [[Papal Bull]] of excommunication during the celebration of the [[Divine Liturgy]].</onlyinclude>