AD 787

787 in various calendars
Gregorian calendar	787; DCCLXXXVII
Ab urbe condita	1540
Armenian calendar	236; ԹՎ ՄԼԶ
Assyrian calendar	5537
Balinese saka calendar	708–709
Bengali calendar	194
Berber calendar	1737
Buddhist calendar	1331
Burmese calendar	149
Byzantine calendar	6295–6296
Chinese calendar	丙寅年 (Fire Tiger); 3484 or 3277; — to —; 丁卯年 (Fire Rabbit); 3485 or 3278
Coptic calendar	503–504
Discordian calendar	1953
Ethiopian calendar	779–780
Hebrew calendar	4547–4548
Hindu calendars
- Vikram Samvat	843–844
- Shaka Samvat	708–709
- Kali Yuga	3887–3888
Holocene calendar	10787
Iranian calendar	165–166
Islamic calendar	170–171
Japanese calendar	Enryaku 6; (延暦６年)
Javanese calendar	682–683
Julian calendar	787; DCCLXXXVII
Korean calendar	3120
Minguo calendar	1125 before ROC; 民前1125年
Nanakshahi calendar	−681
Seleucid era	1098/1099 AG
Thai solar calendar	1329–1330
Tibetan calendar	阳火虎年; (male Fire-Tiger); 913 or 532 or −240; — to —; 阴火兔年; (female Fire-Rabbit); 914 or 533 or −239

Millennium:	1st millennium
Centuries:	7th century; 8th century ; 9th century;
Decades:	760s; 770s; 780s ; 790s; 800s;
Years:	784; 785; 786; 787 ; 788; 789; 790;

Year 787 (DCCLXXXVII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 787 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

Empress Irene sends a Byzantine expeditionary army to invade southern Italy, but it is defeated and driven out (at Pope Adrian I's urging) by the Frankish army, allied with the forces of Benevento. She breaks off the engagement (see 782) between her son Constantine VI and the Frankish princess Rotrude, daughter of King Charlemagne.

August 26 – Arechis II, autonomous prince (or duke) of Benevento, dies. Grimoald III, taken hostage by the Franks, succeeds his father as ruler of Benevento.
Maurizio Galbaio, doge of Venice, dies after a 22-year reign and is succeeded by his son Giovanni. He begins a vendetta against the patriarch of Grado (Italy).

Kings Offa of Mercia and Beorhtric of Wessex call the Synod of Chelsea in Kent, which is attended by the Papal legates. There, Offa persuades the Papacy to grant Archepiscopal status to the Mercian See of Lichfield. In order to secure the royal succession, he has Hygeberht crown his son Ecgfrith king of Mercia at Brixworth.

Second Council of Nicaea: Empress Irene restores the veneration of icons (images of Christ and saints). This is a major victory of the monks, who will advance extensive claims to complete freedom for the Eastern Orthodox Church in religious matters. This ends the iconoclastic period in the Byzantine Empire.