940s

Europe

• The tribe of the Polans begin the construction of the fortified settlements: Giecz, Bnin, Ląd, Gniezno, Poznań, Grzybowo and Ostrów Lednicki in Greater Poland. The Piast Dynasty under Duke Siemomysł gains control over other groups of Polans along the Upper Vistula and establish their rule around Giecz (approximate date).

Japan

• March 25 – Taira no Masakado, the self-proclaimed 'new emperor', is subdued by local rivals who revolt against his rule. His forces are defeated by his cousin, Taira no Sadamori, in Shimōsa Province. Masakado's head is brought back to Emperor Suzaku in Tokyo.^[1]

Literature

• Saadia Gaon, a Jewish rabbi and philosopher, compiles his Siddur (Jewish prayer book) in Arabic and synagogal poetry in modern-day Iraq (approximate date).

Religion

• Narita-san ("New victory temple"), a Shingon Buddhist temple, is founded in Chiba (Japan).

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