785
| 785 • Cologne becomes an archbishopric. |
820
Age: 35y
| 820 • Muslim mathematician Muḥammad ibn Mūsā al-Ḵwārizmī founds algebra. |
Age: 35y
| 785 • Cologne becomes an archbishopric. |
| 820 • Muslim mathematician Muḥammad ibn Mūsā al-Ḵwārizmī founds algebra. |