Boris I of Bulgaria

Life events

1. Born — 828

   Boris was born around 828, the son of Presian I of Bulgaria and heir to the First Bulgarian Empire.

2. Other — 852

   Boris I acceded to the throne of Bulgaria in 852 as ruler (knyaz) of the First Bulgarian Empire, immediately sending emissaries to Eastern Francia to confirm the peace treaty of 845.

3. Baptized — 864

   At the beginning of 864, Boris was secretly baptized at Pliska by a Byzantine embassy, together with his family and select members of the Bulgarian nobility; Emperor Michael III served as his godfather, and Boris adopted the Christian name Michael.

4. Council — 870

   Bulgarian envoys at the Fourth Council of Constantinople in 870 secured for the Bulgarian Church the status of an autocephalous archbishopric under the Patriarchate of Constantinople, determining the future orientation of Bulgarian Orthodoxy.

5. Other — 886

   In 886 Boris welcomed the disciples of Cyril and Methodius — including Clement of Ohrid and Naum of Preslav — who had been exiled from Great Moravia, commissioning Clement as a teacher in the province of Kutmichevitsa to develop Slavonic letters and liturgy.

6. Tonsured — 889

   In 889 Boris abdicated the throne and became a monk, withdrawing from political life to a monastery.

7. Council — 893

   Boris emerged from monastic retirement in 893 to depose his eldest son Vladimir, who had attempted to restore paganism; he then convened the Council of Preslav, replacing Byzantine clergy with native Bulgarians and substituting Old Church Slavonic for Greek as the church language, before enthroning his third son Simeon I.

8. Died — 907

   Boris died on 2 May 907, having spent his final years in monastic life; the location of his monastery and burial place is uncertain, with candidates including sites near Preslav, Pliska, and Ravna Monastery near Varna.

Relationships

Documented claims

• In the summer of 865 a group of Bulgar aristocrats (boyars) revolted against forced baptism; Boris suppressed the rebellion and executed 52 boyars along with their entire families. (likely)
• In August 866 Boris dispatched an embassy led by the kavhan Peter to Pope Nicholas I in Rome with a long list of questions, receiving 106 detailed answers on religion, law, politics, and personal faith. (likely)
• The Cyrillic script, developed by Clement of Ohrid and Naum of Preslav under Boris's patronage, was declared the official alphabet of Bulgaria in 893, the same year Old Bulgarian became the official church language. (likely)
• The Eastern Orthodox Church venerates Boris I with the title Equal-to-the-Apostles (Равноапостолен), recognizing his role in Christianizing Bulgaria; his feast is observed on May 2. (certain)
• Patriarch Photios's 867 encyclical denouncing Roman practices in Bulgaria — prompted by Boris's outreach to Pope Nicholas I — contributed directly to the Photian Schism, an early fracture between the eastern and western churches. (likely)