Christianization

=== Serbia ===
{{Main|Christianization of Serbs}}
[[File:Seal of Strojimir.gif|thumb|right|upright=0.9|Seal of prince [[Strojimir]] of [[Principality of Serbia (early medieval)|Serbia]], from the late 9th century – one of the oldest artifacts of the Christianization of the Serbs|alt=photo of the Seal of prince Strojimir of the Principality of Serbia from the late 9th century – one of the oldest artifacts of the Christianization of the Serbs]]
[[File:Delegation of Croats and Serbs to Emperor Basil I, Skylitzes.jpg|thumb|right|upright=0.9|[[Basil I]] with delegation of Serbs|alt=photo of painting, by Skylitzes, showing a delegation of Croats and Serbs to Emperor Basil I]]
The full conversion of the Slavs dates to the time of [[Eastern Orthodox]] missionaries [[Saints Cyril and Methodius]] during the reign of the Byzantine emperor [[Basil I]] (r. 867–886).{{sfn|Radić|2010|p=232}} The first diocese of Serbia, the [[Diocese of Ras]], is mentioned in the ninth century.{{sfn|Radić|2010|p=232}} Serbs were baptized sometime before [[Basil I]], who was asked by the [[Republic of Ragusa|Ragusians]] for help, sent imperial admiral [[Nikita Orifas]] to [[Mutimir of Serbia|Knez Mutimir]] to aid in the war against the Saracens in 869.{{sfn|Rastko|n.d.}} Serbia can certainly be seen as a Christian nation by 870.{{sfn|Vlasto|1970|p=208}}