Year 1105 (MCV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.
The Tamna Kingdom is annexed by the Korean Goryeo Dynasty.
The crusaders attack Mahdia.
December 31 – Henry IV, Holy Roman Emperor is deposed by his son, Henry V.
The Almoravid emir, Yusuf ibn Tashfin, sends a maritime expedition to Palestine from Sevilla to ward off the Crusaders and maybe to reconquer Jerusalem. The fleet of more or less seventy ships rush into a storm in the Mediterranean and is never seen again.
Roger II of Sicily becomes the Count of Sicily.
Upon the death of Inge the Elder, he is succeeded by his nephew Philip as king of Sweden.
First mention of the consuls of Pavia indicating that the city has become an independent commune.
Sylvester IV is elected antipope in Rome by the supporters of the Holy Emperor.
March 1 – Alfonso VII of Castile (d. 1157)
Sovereign Countess Matilda of Boulogne, queen of England, wife of Stephen of England (d. 1152)
Melisende of Jerusalem (d. 1161)
Ibn Tufail, Andalusian philosopher, physician and official (approximate date; d. 1185)
Rolando Bandinelli, future pope Alexander III (d. 1181)
February 28 – Raymond IV, Count of Toulouse (b. c. 1042)
July 13 – Rashi, Jewish commentator on the Tanakh and Talmud (b. 1040)
Inge the Elder, king of Sweden since 1080
Huang Tingjian, famous Chinese calligrapher, painter, and poet (born 1045)
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