The 800s decade ran from January 1, 800, to December 31, 809.
The 820s decade ran from January 1, 820, to December 31, 829.
The 830s decade ran from January 1, 830, to December 31, 839.
The 840s decade ran from January 1, 840, to December 31, 849.
The 850s decade ran from January 1, 850, to December 31, 859.
The 890s decade ran from January 1, 890, to December 31, 899.
The 900s decade ran from January 1, 900, to December 31, 909.
The 910s decade ran from January 1, 910, to December 31, 919.
The 920s decade ran from January 1, 920, to December 31, 929.
The 960s decade ran from January 1, 960, to December 31, 969.
Year 866 (DCCCLXVI) was a common year starting on Tuesday of the Julian calendar.
Year 923 (CMXXIII) was a common year starting on Wednesday of the Julian calendar.
Year 926 (CMXXVI) was a common year starting on Sunday of the Julian calendar.
Year 873 (DCCCLXXIII) was a common year starting on Thursday of the Julian calendar.
Year 925 (CMXXV) was a common year starting on Saturday of the Julian calendar.
Year 896 (DCCCXCVI) was a leap year starting on Thursday of the Julian calendar.
Year 917 (CMXVII) was a common year starting on Wednesday of the Julian calendar.
Marmais was a Bulgarian military commander, nobleman and komita (duke) of a western Bulgarian region during the reign of Emperor Simeon I (893–927). He was a descendant of an ancient Bulgar family. He participated actively in the Byzantine–Bulgarian war of 913–927 but he is better known for his interference and campaigns against the Principality of Serbia.
The Bulgarian–Serbian wars of 917–924 were a series of conflicts fought between the Bulgarian Empire and the Principality of Serbia as a part of the greater Byzantine–Bulgarian war of 913–927. After the Byzantine army was annihilated by the Bulgarians in the battle of Achelous, the Byzantine diplomacy incited the Principality of Serbia to attack Bulgaria from the west. The Bulgarians dealt with that threat and replaced the Serbian prince with a protégé of their own. In the following years the two empires competed for control over Serbia. In 924 the Serbs rose again, ambushed and defeated a small Bulgarian army. That turn of events provoked a major retaliatory campaign that ended with the annexation of Serbia in the end of the same year.
The Byzantine–Bulgarian war of 913–927 was fought between the Bulgarian Empire and the Byzantine Empire for more than a decade. Although the war was provoked by the Byzantine emperor Alexander's decision to discontinue paying an annual tribute to Bulgaria, the military and ideological initiative was held by Simeon I of Bulgaria, who demanded to be recognized as Tsar and made it clear that he aimed to conquer not only Constantinople but the rest of the Byzantine Empire, as well.
