Millennium:	2nd millennium
Centuries:	11th century 12th century 13th century
Decades:	1120s 1130s 1140s 1150s 1160s
Years:	1142 1143 1144 1145 1146 1147 1148

1145 by topic
Leaders
Political entities State leaders Religious leaders
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments
Art and literature
1145 in poetry
v t e

1145 in various calendars
Gregorian calendar	1145 MCXLV
Ab urbe condita	1898
Armenian calendar	594 ԹՎ ՇՂԴ
Assyrian calendar	5895
Balinese saka calendar	1066–1067
Bengali calendar	552
Berber calendar	2095
English Regnal year	10 Ste. 1 – 11 Ste. 1
Buddhist calendar	1689
Burmese calendar	507
Byzantine calendar	6653–6654
Chinese calendar	甲子年 (Wood Rat) 3842 or 3635 — to — 乙丑年 (Wood Ox) 3843 or 3636
Coptic calendar	861–862
Discordian calendar	2311
Ethiopian calendar	1137–1138
Hebrew calendar	4905–4906
Hindu calendars
- Vikram Samvat	1201–1202
- Shaka Samvat	1066–1067
- Kali Yuga	4245–4246
Holocene calendar	11145
Igbo calendar	145–146
Iranian calendar	523–524
Islamic calendar	539–540
Japanese calendar	Ten'yō 2 / Kyūan 1 (久安元年)
Javanese calendar	1051–1052
Julian calendar	1145 MCXLV
Korean calendar	3478
Minguo calendar	767 before ROC 民前767年
Nanakshahi calendar	−323
Seleucid era	1456/1457 AG
Thai solar calendar	1687–1688
Tibetan calendar	阳木鼠年 (male Wood-Rat) 1271 or 890 or 118 — to — 阴木牛年 (female Wood-Ox) 1272 or 891 or 119

Year 1145 (MCXLV) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.

Events

Spring – Seljuk forces led by Imad al-Din Zengi capture Saruj, the second great Crusader fortress east of the Euphrates. They advance to Birejik and besiege the city, but the garrison puts up a stiff resistance. Meanwhile, Queen-Regent Melisende of Jerusalem joins forces with Joscelin II, count of Edessa and approaches the city. Zengi raises the siege after hearing rumours of trouble in Mosul. He rushes back with his army to take control. There, Zengi is praised throughout Islam as "defender of the faith" and al-Malik al-Mansur, the "victorious king".^[1]
Raymond of Poitiers, prince of Antioch, travels to Constantinople to ask Emperor Manuel I Komnenos for help to support his campaign against the Seljuks. When he arrives, Raymond is forced to accept the suzerainty of the Byzantine Empire. Manuel treats him graciously, gives him gifts and promises him a money subsidy.^[2]

Spring – Arnold of Brescia, an Italian priest from Lombardy, turns Rome into a republic with a government patterned on that of the Roman Republic. Arnold becomes the intellectual leader of the Commune of Rome, calling for liberties and democratic rights after the deposition of Giordano Pierleoni.

Spring – Almohad forces under Abd al-Mu'min defeat a Muslim Almoravid army at Tlemcen.^[3] Almoravid ruler Tashfin ibn Ali dies while escaping his enemies near Oran. He is succeeded by his son Ibrahim ibn Tashfin.
The Merinids of Maghrib al-Aqsa attempt to resist the Almohads but are forced into the desert areas around the Tafilalt.^[3] Oran falls to the Almohads.^[4] A Norman raid against the Tripolitania region succeeds.

Estimation: Merv (in the Seljuk Empire) becomes the largest city in the world, surpassing Constantinople.^[5]

Kim Pusik and his team of historians finish the compilation of the Korean historical text Samguk Sagi.
Construction begins on Notre-Dame de Chartres Cathedral in Chartres, France.

February 15 – Pope Lucius II dies at Rome after having been hit by a stone missile during the fighting against Senatorial forces led by Giordano Pierleoni. He is succeeded after an 11-month pontificate by Eugene III who becomes the 167th pope of the Catholic Church. Eugene is forced into exile by Arnold of Brescia.
Woburn Abbey is founded by the Cistercians in England. A colony of monks arrive from Fountains Abbey to establish a community that will survive until 1234.
December 1 – Eugene III issues the bull Quantum praedecessores, calling for the Second Crusade. At Christmas, King Louis VII announces his intention of making a pilgrimage which becomes part of the Crusade.

Births