1230s births

Majorcan writer and philosopher (c.1232–1315/6)

King of Aragon and Valencia (1276–85); King of Sicily (1282–85)

King of Bohemia (1253-1278)

King of Hungary (1239-1272)

Kaidu (; Middle Mongol: , Modern Mongol: , Khaidu ; c. 1235 – 1301) was a grandson of Ögedei Khan (1186–1241) and thus leader of the House of Ögedei and the de facto khan of the Chagatai Khanate, a division of the Mongol Empire. He ruled parts of modern-day Xinjiang and Central Asia during the 13th century, and actively opposed his cousin, Kublai, who established the Yuan dynasty. Medieval chroniclers often mistranslated Kadan as Kaidu, mistakenly placing Kaidu at the Battle of Legnica. Kadan was the brother of Güyük, and Kaidu's uncle.

King of Cyprus (r. 1267-1284) and King of Jerusalem (r. 1268-1284)

King of Armenian Kingdom of Cilicia

Prince of Antioch and Count of Tripoli (r. 1251-1275)

Danish queen consort (1230-1282)

Serbian queen

Dutch nobleman, reigning over Brabant and Lower Lorraine (1231-1261)

Margrave of Brandenburg

Count of Gorizia and Tyrol, Duke of Carinthia and Margrave of Carniola

Chinese mathematician

21st Grand Master of the Knights Templar

13th-century Emir of Granada

Doge of Venice

saint of third order of Francis (Franciscan tertiary)

Countess of Hainaut (c.1230–1284)

Seljuk Sultan of Rum from 1249 to 1254

Countess of Nevers

Italian poet (1235-1294)

Italian painter and mosaicist

Mangrai (; ; c. 1238–1311) was the 25th king of Ngoenyang (r. 1261–1292) and the first king of Lan Na (r. 1292–1311). He established a new city, Chiang Mai, as the capital of the Lan Na Kingdom (1296–1558).

Genoese admiral (c. 1235 – 1307)

Bolognese jurist and writer on agriculture (1233–1320)

Occitan poet and composer

Lord of Mecklenburg

Queen of Cyprus

German prince

Byzantine monk and noble

Duchess of Brabant (1233-1273)

person associated with Hebrew manuscripts

Norwegian queen consort

Swedish Dominican friar

Princess of Hungary

Italian catholic cardinal

Hungarian noble

Russian saint (c. 1240–c. 1299)

Armenian composer

English nobleman and soldier, Earl of Warwick

French witch

Primate of Spain and Cardinal-bishop of Albano

German poet and writer (c. 1230-1313)

13th-century Dutch writer

Persian poet

French noble

French writer

Portuguese writer

Count of the Weimar-Orlamünde

English Baron (1231–1282)

Archbishop-elect of Canterbury; Bishop of Bath and Wells; Bishop-elect of Winchester

Polish princess (1230-?)

Byzantine general and governor

Count of Urgell

Chancellor of the Exchequer; Lord Chancellor of England; Bishop of Worcester

Italian knight (1238-1328), lord of the English Channel Islands

Polish duchess

French baron and military leader

Hungarian baron and landowner (1230s–1283)