 | Óengus of Moray was the last King of Moray of the native line, ruling Moray in what is now... more » |
| Offa is a legendary king of the Angles in the genealogy of the kings of Mercia presented in the... more » |
 | Ogbidi Okojie, Onojie of Uromi was a ruler of the Esan people in what is now Edo State in... more » |
| Ögedei Khan, born Ögedei was the third son of Genghis Khan and second Great Khan of the Mongol... more » |
| Óláfr Guðrøðarson was a mid twelfth-century King of the Isles. As a younger son of Gofraid... more » |
 | Olaf I of Denmark was king of Denmark from 1086 to 1095, following the death of his brother... more » |
 | Olaf Tryggvason was King of Norway from 995 to 1000. He was the son of Tryggvi Olafsson, king of... more » |
 | Olaf II Haakonsson was king of Denmark as Olaf II and king of Norway as Olaf IV. Olaf was son of... more » |
| Óláfr Guðrøðarson, commonly known in English as Olaf the Black, was a mid 13th century sea-king... more » |
 | Olav V was the King of Norway from 1957 until his death. A member of the House of... more » |
| Oleg of Novgorod was a Varangian prince who ruled all or part of the Rus' people during the... more » |
 | Saint Olga was a ruler of Kievan Rus' as regent for her son, Svyatoslav. In 1997 the Order of... more » |
 | Öljei Temür Khan, Bunyashir Khan was the Mongol khan of the Northern Yuan Dynasty in Mongolia... more » |
| Olof Björnsson, was a semi-legendary Swedish king, who according to Hervarar saga and the... more » |
 | Olof Skötkonung, also known as Olaf Eiríksson was King of Sweden, son of Eric the Victorious... more » |
| Olaf, according to the Danish king Sweyn Estridson and Adam of Bremen, was a Swedish chieftain... more » |
| Anicius Olybrius was Western Roman Emperor from April or May 472 to his death. He was in reality... more » |
 | Omar Ali Saifuddin I was the Sultan of Brunei from 1740 until his death in 1795. He succeeded... more » |
| Sultan Omar Ali Saifuddien II was the 23rd Sultan of Brunei. more » |
| Ongendus was a king of the Danes, reigning c. 710, the first Danish king known from contemporary... more » |
 | Otumfuo Opoku Ware II was the fifteenth King of the Ashanti people in Ghana. The future monarch... more » |
| Orhan or Orhan Bey was the second bey of the nascent Ottoman Empire from 1326 to 1362. He was... more » |
| Örüg Temür or Gulichi was a Mongol leader who temporarily enthroned himself Khan of the Mongols... more » |
 | Oscar I was King of Sweden and Norway from 1844 to his death. When, in August 1810, his father... more » |
| Oscar II, baptised Oscar Fredrik, was King of Sweden from 1872 until his death and King of... more » |
