Year 1117 (MCXVII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.
Conflict between the de facto independent republics of Mahdia and Gabes in Ifriqiya. Madhia is supported by the Zirid dynasty while Gabes receives the aid of the Roger I of Sicily.
Arslan-Shah of Ghazna loses the Battle of Ghazni.
Pelusium is razed by Baldwin I of Jerusalem.
Miidera and the sohei of Enryakuji attack Nara, Japan.
Borivoj II of Bohemia becomes prince in place of Vladislav I of Bohemia.
The people of Santiago de Compostela (present-day Spain) try to burn their prelate in his palace, along with the queen.
Iceland abolishes slavery.
Short-lived Almoravid reconquest of Coimbra (Portugal).
Stephen II of Hungary regains Dalmatia from the Republic of Venice while the Venetians are on a naval expedition, Doge Ordelafo Faliero dying in battle near Zadar; Domenico Michele, elected Doge to succeed him, reconquers the territory and agrees a 5-year truce.
May 3 – Merton Priory (near London) is consecrated.
The earliest use of a compass for navigational purposes is recorded.
1116/17 (AH 510; possible date) – Old Bridge, Hasankeyf, over the Tigris in Turkey, is built by the Artuqids; its central arch is one of (or perhaps the) longest in the world at this time.
Humphrey II of Toron, Constable of Jerusalem
December 9 – Gertrude of Brunswick, Markgräfin of Meißen
Anselm of Laon, French theologian
Ivo of Chartres, French canon lawyer (b. 1040)
Bertrade de Montfort, wife of Fulk IV of Anjou and Philip I of France
Li Zhiyi, Chinese poet
Ỷ Lan, Vietnamese Empress Regent
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