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I don't think Angel numbers should be allowed.

1227 was the year of death of Genghis Khan.

1229 is the exact number of prime numbers less than 10^4.

1230 AD Alfonso IX dies after a 42-year reign and is succeeded by his son Ferdinand III.

1231 Universtity of Cambridge granted Royal Charter by Henry III

University even

1232
June 15 – Battle of Agridi: The Cypriot army under King Henry I (the Fat) defeats the Lombard forces of Emperor Frederick II. After the battle, John of Beirut (supported by funds from Henry), hires 13 Genoese war-galleys to aid in the siege of Kyrenia.
July 16 – Muhammad I is elected as ruler of the Taifa of Arjona. He revolts against Ibn Hud, the independent ruler of Al-Andalus, and takes control of the city. Beginning the foundation of the Nasrid Dynasty.
Wikipedia

1233 is the Scott # of the 5 cent US postal stamp produced in 1963 - displaying broken chains - celebrating the 100th anniversary of Lincoln's Emancipation Proclamation.

1234
is a number in counting order
is an even number
is not prime
the numbers add to 10
is pretty awesome

STARLINK 1235 is currently orbiting offshore Western Australia

1236

Castilian forces under King Ferdinand III capture Muslim Córdoba from Emir Ibn Hud, as part of the Reconquista of the Iberian Peninsula

1237

Aragonese forces under Bernat Guillem de Montpeller defeat the Muslim army of the Taifa of Valencia at El Puig. The Almohad forces are routed, and many of the soldiers are slain in the action. Zayyan ibn Mardanish, Almohad ruler and governor of Valencia, is forced to go into exile to Tunisia, while offering the surrender of all castles from the Turia River to Tortosa and Teruel

1238

The Mongols under Batu Khan and Subutai campaign across the northern heartland of the Kievan Rus', committing numerous atrocities across multiple settlements, including the sacking of an irrelevant little town known as Moscow. According to the Chronicle of Novgorod, Moscow is a fortified village, a trading post "on a crossroads of four rivers". The village is taken by the Mongols after 5 days of siege.

I think we should ban mathematical posts.

1239 The year of birth of King Edward I of England.

1240 AD Battle of the Neva: A Swedish army under Bishop Thomas sails up the Gulf of Finland in their longboats. They proceed into the Neva River with the aim of seizing control over Lake Ladoga and from there, striking at the city of Novgorod. Prince Alexander rallies his druzhina comparable to the 'household' of western European countries and decisively routes the Swedish forces. Saving the Novgorod Republic from a full-scale enemy invasion from the North. Alexander won his first military victory at the age of 19 and receives the title of Nevsky.

1241 AD Death of Mongol Khan Ogadai leaves Alexander to deal with the west without having to pay attention to the east.

1242 AD Battle of Lake Peipus, Alexander Nevsky defeats a force of Teutonic Knights in what is his most famous battle, fighting on the ice surface of the lake.

PRINCE WILLIAM wrote: ↑

Mon Apr 11, 2022 3:01 pm

1242 AD Battle of Lake Peipus, Alexander Nevsky defeats a force of Teutonic Knights in what is his most famous battle, fighting on the ice surface of the lake.

Prokofiev's "Alexander Nevsky" deserves an honorable mention here--excellent music which includes a depiction of the battle on the ice.

In the key of C major, scale degrees 1243 make up the famous opening of the highly contrapuntal fourth movement of one of Mozart's greatest symphonies, Symphony No. 41, nicknamed "Jupiter" for the grand scale of the piece.

21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21! 21!

1244

1245 In the First Council of Lyon (a general church council held at Lyon), Innocent IV declares Emperor Frederick II excommunicated and deposed. He proclaims the Seventh Crusade. He also sends Giovanni da Pian del Carpine (accompanied by Stephen of Bohemia) to the Mongol court at the Karakorum, suggesting that the Mongols convert to Christianity.

1246 AD The aforementioned mission is present at the coronation of Güyük Khan, the eldest son of Ögedei Khan, who is enthroned as the 3rd Great Khan of the Mongol Empire. The new Khan proceeds immediately to planing an invasion of Persia.

1+2+4=7

1248 Jugurtha is a stony background asteroid from the central regions of the asteroid belt, approximately 29 kilometers (18 miles) in diameter. Discovered by Cyril Jackson at the Union Observatory in 1932, the asteroid was named after Jugurtha, the ancient North African king of Numidia. The S-type asteroid is likely elongated in shape and has a rotation period of 12.9 hours.

wikipedia

1249
Louis IX lands with a Crusader force and captures Damietta, after a fierce battle at the edge of the sea. The onslaught of the knights of France and those of Outremer under John of Ibelin, force the Ayyubids back with heavy losses. At nightfall, Fakhr ad-Din withdraws his army over a bridge of boats to Damietta. Finding the population there in panic and the garrison wavering, Fakhr ad-Din decides to evacuate the city. On June 6, Louis marches triumphantly over the bridge into Damietta and builds a camp to attack Cairo.[2]
November 20 – Louis IX sets out (against the advice of his nobles) with a Crusader force from Damietta, along the southern road to Mansourah. A garrison is left to guard the city – where Queen Margaret of Provence and Patriarch Robert of Nantes remain. The Crusaders make slow progress along the Nile, carrying a number of supplies and equipment. After 32 days, Louis orders to made camp opposite the Ayyubid camp near Mansourah, protected by a branch of the river and fortifications. Both camps use their catapults to bombard each other.[3]
December – Louis IX consolidates his forces at Mansourah. After the death of Sultan As-Salih Ayyub, Fakhr ad-Din becomes effectively the ruler of Egypt. He takes command of the city's defense and his cavalry harasses the Crusaders but none of these skirmishes is successful in holding up the Crusader's advance. Meanwhile, Louis orders the construction of a dyke at Mansourah, although the Crusaders build covered galleries to protect the workmen, the Egyptian bombardment (particularly Greek fire), is so formidable that the work is halted.[4]

1250 AD year of birth of John, last Emperor of Nicaea.