1124

Year 1124 was a leap year starting on Tuesday of the Julian calendar, the 1124th year of the Common Era and Anno Domini designations, the 124th year of the 2nd millennium, the 24th year of the 12th century, and the 5th year of the 1120s decade.

January – March

January - Belek Ghazi, Bey of Artuqids, and Toghtekin, Emir of Damascus, have breached the defenses of Azaz (northwest of Aleppo in Syria but are repulsed by Crusaders.
February 15 - the Venetians and the Franks began the siege of the seaport of Tyre, now in Lebanon, ruled by Toghtekin, the atabeg of Damascus. The Christian army was led by the Patriarch of Antioch, the doge of Venice, Pons, Count of Tripoli and William de Bury, the king's constable.
March 26 - Henry I of England's forces defeated the Norman rebels at the Battle of Bourgthéroulde.

April 27 - David I succeeds Alexander I as the King of Scotland.
May 6 - Belek Ghazi, Bey of Artuqids was hit and killed by an arrow during the siege of Manbij.
June 6 -German missionary Otto of Bamberg carried out the first baptism on his mission to convert the residents of the Duchy of Pomerania to Christianity, carrying out a baptism in Pyritz
June - Toghtekin, the atabeg of Damascus, sent envoys to the Crusaders encampment to negotiate peace. After lengthy and difficult discussions, it was agreed that the terms of surrender would include letting those who wanted to leave the city take their families and property with them. Meanwhile those who wanted to stay must keep their houses and possessions. This was unpopular with some of the crusaders, who wanted to loot the city.

July 7 are handed over to Timurtash to secure the payment of the balance, Baldwin is released.
September - After agreeing to help Timurtash fight a rival, the Amir Dubays bin Sadaqa, as a condition of being released, King Baldwin II of Jerusalem enters into an alliance with Dubays and promises him parts of the territory of Aleppo. Timurtash asks for help from his brother Suleiman of Mayyafariqin, but the two brothers fail to get along, leaving Aleppo vulnerable.

October 6 - The siege of Aleppo by Baldwin II of Jerusalem and his allies begins. The fortress surrenders after less than four months, on January 25.
November 1 - Beltrán de Risnel confirms two charters of issued by King Alfonso VII during the reign of Queen Urraca of León and Castile.
November 5 - Gutierre Fernández de Castro and his wife Toda receive half of the lands owned by her grandmother, Teresa, at Quintanilla Rodano, Quintana Fortuno and Sotopalacios.
November 19 - Archbishop Adelbert I of Mainz acknowledges ownership by Odo of the Abbey of Saint-Remi in Reims, as wellas the churches around Kusel, of the Church of Kusel, Altenglan, Konken and Pfeffelbach.
December 9 - Raymond du Puy of France formally succeeds Gerard as the second Grand Master of the Knights Hospitaller and issues his first official act.
December 16 - 1124 papal election: Teobaldo Boccapecci is elected the new Pope, three days after the death of Pope Callixtus II. Boccapecci takes the name Celestine II, but the Frangipani family attacks the investment ceremony and Boccapecci is injured. He resigns before being enthroned in order to avoid schism.
December 21 - 1124 papal election: Lamberto Scannabecchi is elected Pope after Teobaldo Boccapecci is rejected. Scannabecchi takes the name Pope Honorius II.

Gaufrid is consecrated as the first Abbot of Dunfermline Abbey.
The Dun Beal Gallimhe is erected by King Tairrdelbach Ua Conchobair of Connacht.
In Ireland, Saint Malachy, the great reformer of the Church, is made a bishop.
- The High School of Glasgow is founded as the choir school of Glasgow Cathedral, in Scotland.