109 BC

Millennium:	1st millennium BC
Centuries:	3rd century BC 2nd century BC 1st century BC
Decades:	120s BC 110s BC 100s BC 90s BC 80s BC
Years:	112 BC 111 BC 110 BC 109 BC 108 BC 107 BC 106 BC

109 BC in various calendars

Gregorian calendar	109 BC CIX BC
Ab urbe condita	645
Ancient Egypt era	XXXIII dynasty, 215
- Pharaoh	Ptolemy IX Lathyros, 8
Ancient Greek era	167th Olympiad, year 4
Assyrian calendar	4642
Balinese saka calendar	N/A
Bengali calendar	−701
Berber calendar	842
Buddhist calendar	436
Burmese calendar	−746
Byzantine calendar	5400–5401
Chinese calendar	辛未年 (Metal Goat) 2589 or 2382     — to — 壬申年 (Water Monkey) 2590 or 2383
Coptic calendar	−392 – −391
Discordian calendar	1058
Ethiopian calendar	−116 – −115
Hebrew calendar	3652–3653
Hindu calendars
- Vikram Samvat	−52 – −51
- Shaka Samvat	N/A
- Kali Yuga	2992–2993
Holocene calendar	9892
Iranian calendar	730 BP – 729 BP
Islamic calendar	752 BH – 751 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2225
Minguo calendar	2020 before ROC 民前2020年
Nanakshahi calendar	−1576
Seleucid era	203/204 AG
Thai solar calendar	434–435
Tibetan calendar	阴金羊年 (female Iron-Goat) 18 or −363 or −1135     — to — 阳水猴年 (male Water-Monkey) 19 or −362 or −1134

Year 109 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Numidicus and Silanus (or, less frequently, year 645 Ab urbe condita). The denomination 109 BC 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

Asia

• Han campaigns against Dian: Emperor Wu of Han launches a new campaign against the Dian Kingdom and establishes the Yizhou commandery in Yunnan during the dynasty's expansion southward.

Roman Republic

• A Roman army under Marcus Junius Silanus (consul 109 BC) is defeated by the Cimbri and Teutones near the river Rhone.