Born on 12th day

September 12, 346 Maximin of Trier the fifth bishop of Trier, according to the list provided by the diocese's website, taking his seat in 341/342. Maximin was an opponent of Arianism, and was supported by the courts of Constantine II and Constans, who harboured as an honored guest Athanasius twice during his exile from Alexandria, in 336-37, before he was bishop, and again in 343. In the Arian controversy he had begun in the party of Paul of Constantinople; however, he took part in the synod of Sardica convoked by Pope Julius I , and when four Arian bishops consequently came from Antioch to Trier with the purpose of winning Emperor Constans to their side, Maximinus refused to receive them and induced the emperor to reject their proposals
August 12, 652 Ségéne mac Fiachnaí the fifth abbot of the Iona Abbey in Scotland.
February 12, 661 Princess Ōku a Japanese princess during the Asuka period in Japanese history. She was the daughter of Emperor Temmu and sister of Prince Ōtsu. As a young girl, she witnessed the Jinshin War. According to the Man'yōshū , she became the first Saiō to serve at Ise Grand Shrine. After the death of her brother in 686, she returned from Ise to Yamato to enshrine his remains on Futakami, before a quiet end to her life at age 40
April 12, 811 Muhammad al-Jawad the ninth of the Twelve Imams of Twelver Shi'ism. His given name was Muhammad ibn ‘Alī ibn Mūsā, and among his titles, al-Taqī and al-Jawād are the most renowned. Muhammad al-Taqī was the shortest-lived of the Twelve Imāms, dying at the age of 25
November 12, 857 Erispoe Duke of Brittany from 851. After the death of his father Nominoe, he led a successful military campaign against the Franks, culminating in his victory at the Battle of Jengland. He is subsequently referred to as "King of Brittany"
April 12, 901 Eudokia Baïana the third wife of Leo VI the Wise.
December 12, 926 William II Duke of Aquitaine the Count of Auvergne and Duke of Aquitaine from 918 to his death, succeeding his uncle William I.
June 12, 949 Emperor Reizei the 63rd emperor of Japan, according to the traditional order of succession.
October 12, 1006 Emperor Go-Ichijō the 68th emperor of Japan, according to the traditional order of succession.
September 12, 1012 Ad-Da'i Yusuf an imam of the Zaidi state in Yemen who ruled for two highly turbulent terms.
February 12, 1074 Conrad II of Italy the Duke of Lower Lorraine , King of Germany and King of Italy. He was the second son of Holy Roman Emperor Henry IV and Bertha of Savoy, and their eldest son to reach adulthood, his older brother Henry having been born and died in the same month of August 1071. Although Conrad's rule in Lorraine and Germany was nominal, he spent most of his life in Italy and there he was king in fact as well as in name
June 12, 1107 Emperor Gaozong of Song the tenth emperor of the Song dynasty of China. He reigned from 1127 to 1162. Gaozong fled south after the Jurchens overran Kaifeng during the Jingkang Incident of the Jin–Song wars and became the first emperor of what is now known as the Southern Song dynasty after he reëstablished his seat of government at Lin'an
April 12, 1116 Richeza of Poland Queen of Sweden queen of Sweden and princess of Minsk through her three marriages.
February 12, 1128 Toghtekin a Turkic military leader, who was atabeg of Damascus from 1104 to 1128. He was the founder of the Burid dynasty of Damascus
November 12, 1139 Sigurd Slembe a Norwegian pretender to the throne.
June 12, 1161 Constance Duchess of Brittany Duchess of Brittany and Countess of Richmond between 1166 and 1201. Constance was the only surviving child of Duke Conan IV by his wife, Margaret of Huntingdon, a sister of the Scottish kings Malcolm IV and William I
October 12, 1161 Henry V Duke of Carinthia the margrave of Verona from 1144 until 1151 and the duke of Carinthia from 1144 to his death. According to the contemporary chronicler Otto of Freising, Henry was "a valiant man, experienced in the councils of war"
February 12, 1218 Kujō Yoritsune the fourth shogun of the Kamakura shogunate of Japan. His father was kanpaku Kujō Michiie and his grandmother was a niece of Minamoto no Yoritomo. He was born in the year of the Tiger, in the month, on the day, and so his given name at birth was Mitora
August 12, 1222 Vladislaus III Duke of Bohemia the youngest son of Vladislaus II and younger brother of Ottokar On 22 June 1197, he was elected Duke of Bohemia. Faced with an uprising in favour of Ottokar, Vladislaus abdicated a few months later, on 6 December. Ottokar then took the Bohemian throne without imperial approval and compensated Vladislaus with the near-autonomous margravate of Moravia. By his repudiation of the throne, Vladislaus helped to bring an end to the destructive dynastic wars of the Přemyslids, which had lasted for over twenty-five years from the death of his father. He was the 25th and last duke of Bohemia
May 12, 1258 Sancho IV of Castile the King of Castile, León and Galicia from 1284 to his death. He was the second son of Alfonso X and Yolanda, daughter of James I of Aragon
March 12, 1270 Charles Count of Valois the fourth son of Philip III of France and Isabella of Aragon. He was a member of the House of Capet and founded the House of Valois. In 1284, he was created Count of Valois by his father and, in 1290, received the title of Count of Anjou from his marriage to Margaret of Anjou
June 12, 1294 John I of Brienne Count of Eu the son of Alphonso of Brienne and Marie de Lusigan. His mother was the heiress of Eu, Seine-Maritime, and he succeeded his father as Count of Eu in 1270
December 12, 1298 Albert II Duke of Austria Duke of Austria.
March 12, 1312 John de Vere 7th Earl of Oxford the nephew and heir of Robert de Vere, 6th Earl of Oxford who succeeded as Earl of Oxford in 1331, after his uncle died without issue.
February 12, 1322 John Henry Margrave of Moravia Count of Tyrol from 1335 to 1341 and Margrave of Moravia from 1349 until his death.
May 12, 1325 Rupert II Elector Palatine Count Palatine of the Rhine. He was the Elector Palatine of the Rhine from the house of Wittelsbach in 1390–1398
May 12, 1330 William I Duke of Bavaria the second son of the emperor Louis IV the Bavarian from his second wife Margaret of Holland and Hainaut. He was also known as William V, Count of Holland, as William III, Count of Hainaut and as William IV, Count of Zeeland
March 12, 1336 Edward Duke of Guelders the youngest son of Rainald II of Guelders and his second wife, Eleanor of Woodstock, daughter of Edward II of England.
August 12, 1342 Guy I Count of Blois Count of Blois and Lord of Avesnes 1307–1342.
October 12, 1350 Dmitry Donskoy Saint Dmitry Ivanovich Donskoy , or Dmitry of the Don, sometimes referred to simply as Dmitry , son of Ivan II the Meek of Moscow , reigned as the Prince of Moscow from 1359 and Grand Prince of Vladimir from 1363 to his death. He was the first prince of Moscow to openly challenge Mongol authority in Russia. His nickname, Donskoy , alludes to his great victory against the Tatars in the Battle of Kulikovo which took place on the Don River. He is venerated as a Saint in the Orthodox Church with his feast day on 19 May
March 12, 1386 Ashikaga Yoshimochi the 4th shogun of the Ashikaga shogunate who reigned from 1394 to 1423 during the Muromachi period of Japan. Yoshimochi was the son of the third shogun Ashikaga Yoshimitsu
July 12, 1394 Ashikaga Yoshinori the 6th shogun of the Ashikaga shogunate who reigned from 1429 to 1441 during the Muromachi period of Japan. Yoshinori was the son of the third shogun Ashikaga Yoshimitsu
August 12, 1399 Demetrius I Starshy the second eldest son of Algirdas, Grand Duke of Lithuania, and his first wife Maria of Vitebsk. He was Duke of Bryansk from 1356 to 1379 and from 1388 to 1399
May 12, 1401 Emperor Shōkō the 101st emperor of Japan, according to the traditional order of succession. His reign spanned the years from 1412 through 1428
December 12, 1418 Albert VI Archduke of Austria also known as the Prodigal, from the House of Habsburg was, with his elder brother Emperor Frederick III, an Archduke of Inner Austria from 1424 and of Austria from 1457 until his death. According to tradition, Albert was the exact opposite of Frederick, energetic and inclined to thoughtlessness
April 12, 1432 Anne of Austria Landgravine of Thuringia a Duchess of Luxembourg in her own right, and as consort, Landgravine of Thuringia and of Saxony.
February 12, 1438 Adolf Duke of Guelders a Duke of Guelders, Count of Zutphen from 1465–1471 and in 1477.
February 12, 1443 Giovanni II Bentivoglio an Italian nobleman who ruled as tyrant of Bologna from 1463 until 1506. He had no formal position, but held power as the city's "first citizen." The Bentivoglio family ruled over Bologna from 1443, and repeatedly attempted to consolidate their hold of the Signoria of the city
August 12, 1452 Abraham Zacuto a Sephardi Jewish astronomer, astrologer, mathematician, rabbi and historian who served as Royal Astronomer in the 15th century to King John II of Portugal. The crater Zagut on the Moon is named after him
July 12, 1468 Juan del Encina a composer, poet and playwright,:535 often called the founder, along with Gil Vicente, of Spanish drama. His name at birth was Juan de Fermoselle
July 12, 1477 Jacopo Sadoleto Catholic Bishop and Cardinal, loyal to the Catholic Church.
March 12, 1479 Giuliano de' Medici Duke of Nemours an Italian nobleman, the third son of Lorenzo the Magnificent.
May 12, 1479 Pompeo Colonna an Italian Cardinal, politician and condottiero.
August 12, 1481 Jorge de Lencastre Duke of Coimbra a Portuguese Prince, illegitimate son of King John II of Portugal and Ana de Mendonça, a maid of Joanna la Beltraneja. He became the second Duke of Coimbra in 1509. He was also master of the Order of Santiago and administrator of the Order of Aviz from 1492 to 1550
January 12, 1483 Henry III of Nassau-Breda a count of the House of Nassau.
April 12, 1484 Antonio da Sangallo the Younger an Italian architect active during the Renaissance.
April 12, 1484 Rana Sanga the Rajput ruler of Mewar, which was located within the geographic boundaries of present-day India's modern state of Rajasthan. He ruled between 1509 and 1527
October 12, 1490 Bernardo Pisano an Italian composer, priest, singer, and scholar of the Renaissance. He was one of the first madrigalists, and the first composer anywhere to have a printed collection of secular music devoted entirely to himself
September 12, 1492 Lorenzo de' Medici Duke of Urbino the ruler of Florence from 1513 to his death in 1519. He was also Duke of Urbino from 1516 to 1519. His illegitimate son, Alessandro de' Medici, became the first Duke of Florence
September 12, 1494 Francis I of France a monarch of the House of Valois who ruled as King of France from 1515 until his death. He was the son of Charles, Count of Angoulême, and Louise of Savoy. He succeeded his cousin and father-in-law Louis XII, who died without a male heir