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705 ( ) was a DCCV common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 705 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Spring – An army of 15,000
Bulgar and Slav horsemen under Justinian II appear before the walls of Constantinople. After three days, his troops discover an unused  water conduit under the walls of the city, and enter through the Valens Aqueduct. Hearing that Justinian has taken control of the Blachernae Palace, Emperor Tiberios III flees to Bithynia (modern Turkey), where he evades capture for several months.  Justinian II ascends again to the throne and rewards his ally Tervel, ruler ( ) of the khagan Bulgarian Empire, for his assistance with the title of kaisar ( ), which makes him second only to Justinian and the first foreign ruler in Caesar Byzantine history to receive such a title, and a territorial concession in northeastern Thrace, a region called Zagora in modern-day Bulgaria.  
Arab forces gain power in Central Asia, as Qutayba ibn Muslim becomes governor of Khorasan. The region has grown rich from trade with China and Eastern Europe, its merchants dealing in silk, furs, amber, honey, and walrus ivory. During his rule, Qutayba subjugates the mercantile cities of Bukhara and Samarkand (modern Uzbekistan), as well as the Oxus delta area of Khwarezm, south of the Aral Sea.
October 8 – Caliph Abd al-Malik ibn Marwan dies in his winter resort at Al-Sinnabra ( Palestine), after a 20-year reign. During his rule, the financial administration of the Umayyad Caliphate has been reorganized. Arab coins have replaced former Byzantine and Sassanian coins, and regular postal service has been established between Damascus and the provincial capitals. Abd al-Malik is succeeded by his son Al-Walid I.   Arab conquest of Armenia: Large-scale Armenian rebellion is suppressed by Muhammad ibn Marwan. He captures and deports Smbat VI Bagratuni and other leading princes. Many of the captured are gathered into churches and burned alive at nakharar Nakhchevan (modern Azerbaijan).  
February 22 – Empress Wu Zetian is deposed in a coup d'état organized by her chancellor Zhang Jianzhi, after a 15-year reign. His chief ministers gain support from some generals to seize the imperial palace and execute the Zhang brothers. They reinstall her son Zhong Zong, whom she deposed 15 years ago, restoring the Tang dynasty. This marks the end of the short-lived Zhou dynasty in China.
January 11 – Pope John VI
October 8 – Abd al-Malik ibn Marwan, Muslim caliph (b. 646)
December 16 – Wu Zetian, Empress of the Zhou Dynasty (b. 624)
Aldfrith, king of Northumbria (or 704)
Bosa, bishop of York (approximate date)
Cellach mac Rogallaig, king of Connacht ( Ireland)
Hædde, bishop of Winchester (approximate date)
Heraclius, Byzantine general ( ) monostrategos
Kallinikos I, patriarch of Constantinople (or 706)
Lambert of Maastricht, bishop (approximate date) Varaz Trdat I, king of Caucasian Albania
^ Ostrogorsky, pp. 124–126
^ Norwich, p. 337
^ a b c d
Venning, Timothy, ed. (2006). A Chronology of the Byzantine Empire. Palgrave Macmillan. p. 190. ISBN 1-4039-1774-4.
Treadgold, Warren T. (1997), , Stanford, CA: Stanford University Press, p. 340, A History of the Byzantine State and Society ISBN 0-8047-2630-2
^ Paul the Deacon, Chapter XXVII. Identified as
Puteoli or a location at the five mile mark of the Via Latina,
Earliest English Kings, pp. 125–126
^ a b
Treadgold, Warren T. (1997), , Stanford, CA: Stanford University Press, p. 341, A History of the Byzantine State and Society ISBN 0-8047-2630-2