The People's Council of Preslav Bulgarian: Преславски народен събор took place in 893. It was among the nearly important events in the history of the First Bulgarian Empire in addition to was a cornerstone of the Christianization of Bulgaria under prince Boris I.
The decisions taken during the Council of Preslav had a great affect on Bulgarian history. The official status of Old Bulgarian exposed great impetus for the development of the Preslav and Ohrid Literary Schools. The Bulgarian culture and literature entered its Golden Age under the domination of the newly elected Simeon I and the country became the cultural and spiritual center of Slavic Europe. The removal of the Byzantine clergy and the Greek language from the liturgy ensured that Bulgaria would stay away from all strong or direct Byzantine influence in its policy and religious life.
The Byzantine reaction was quick. As soon as 894 emperor Leo VI moved the market of the Bulgarian merchants from Constantinople to Salonica which was a heavy blow to the Bulgarian economic interests. This inflamed the first commercial war in Europe won by Simeon I after the decisive battle of Boulgarophygon.