628

628 in various calendars
Gregorian calendar	628; DCXXVIII
Ab urbe condita	1381
Armenian calendar	77; ԹՎ ՀԷ
Assyrian calendar	5378
Balinese saka calendar	549–550
Bengali calendar	35
Berber calendar	1578
Buddhist calendar	1172
Burmese calendar	−10
Byzantine calendar	6136–6137
Chinese calendar	丁亥年 (Fire Pig); 3325 or 3118; — to —; 戊子年 (Earth Rat); 3326 or 3119
Coptic calendar	344–345
Discordian calendar	1794
Ethiopian calendar	620–621
Hebrew calendar	4388–4389
Hindu calendars
- Vikram Samvat	684–685
- Shaka Samvat	549–550
- Kali Yuga	3728–3729
Holocene calendar	10628
Iranian calendar	6–7
Islamic calendar	6–7
Japanese calendar	N/A
Javanese calendar	518–519
Julian calendar	628; DCXXVIII
Korean calendar	2961
Minguo calendar	1284 before ROC; 民前1284年
Nanakshahi calendar	−840
Seleucid era	939/940 AG
Thai solar calendar	1170–1171
Tibetan calendar	阴火猪年; (female Fire-Pig); 754 or 373 or −399; — to —; 阳土鼠年; (male Earth-Rat); 755 or 374 or −398

Millennium:	1st millennium
Centuries:	6th century; 7th century ; 8th century;
Decades:	600s; 610s; 620s ; 630s; 640s;
Years:	625; 626; 627; 628 ; 629; 630; 631;

Year 628 (DCXXVIII) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 628 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.

Events

Spring – Byzantine–Sassanid War: Emperor Heraclius issues an ultimatum for peace to king Khosrow II, but he refuses his generous terms. The war-weary Persians revolt against Khosrow's regime at Ctesiphon and install his son Kavadh II to the throne on February 25. He puts his father to death and begins negotiations with Heraclius. Kavadh is forced to return all the territories conquered during the war. The Persians must give up all of the trophies they have captured, including the relic of the True Cross. Evidently there is also a large financial indemnity. Having accepted a peace agreement on his own terms, Heraclius returns in triumph to Constantinople.^[1]
Third Perso-Turkic War: The Western Göktürks under their leader Tong Yabghu Qaghan plunder Tbilisi (modern Georgia). The Persian defenders are executed or mutilated, Tong Yabghu appoints governors (tuduns) to manage various tribes under his overlordship.^[2]

Battle of Cirencester: King Penda of Mercia defeats the West Saxons at Cirencester (south-west England) in what later will be Gloucestershire. After reaching an agreement, he takes control of the Severn Valley and the minor kingdom of the Hwicce.^[3]^[4]

February 25 – Khosrow II, the last great king of the Sasanian Empire, is overthrown by his son Kavadh II.
September 6 – Ardashir III, age 7, succeeds his father Kavadh II as the twenty-fourth king of the Sasanian Empire on the latter's death from plague.

Muhammad, Islamic prophet, leads about 1,400 men on a pilgrimage to Mecca where their passage is blocked. The Quraysh tribe and the Muslim community in Medina sign a 10-year truce (Treaty of Hudaybiyyah).

Indian astronomer Brahmagupta writes the Brāhmasphuṭasiddhānta, an early, yet very advanced, mathematics book, including rules for computing with zero.

The Sharia enjoins women as well as men to obtain secular and religious educations. It forbids eating pork, domesticated donkey, and other flesh denied to Jews by Mosaic law (approximate date).

Muhammad's letters to world leaders explain the principles of the new monotheistic Muslim faith, as they will be contained in his book, the Quran.

^ Kaegi, Walter Emil (2003), Heraclius: Emperor of Byzantium, Cambridge University Press, p. 178, 189–190. ISBN 0-521-81459-6
^ Christian 283; Artamanov, p. 170–180
^ The Anglo-Saxon Chronicle
^ Palmer, Alan & Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 30–34. ISBN 0-7126-5616-2.