Thankmar, Half-Brother of Otto I, Killed During the Siege of Eresburg
On July 27, 938, Thankmar, the elder half-brother of King Otto I of Germany, was killed during the Siege of Eresburg. Born around 908, Thankmar had rebelled against Otto’s rule as part of a wider struggle among German nobles over royal authority and influence.
After being defeated and forced to retreat to Eresburg Castle, Thankmar was surrounded by Otto’s forces. When the fortress fell, he sought sanctuary inside a church, but he was attacked and killed there, according to contemporary accounts. His death brought an end to one of the earliest major rebellions against Otto I’s reign.
Thankmar’s fate demonstrates the dangerous nature of medieval dynastic conflicts, where disputes between royal relatives could quickly turn into armed rebellion. His death helped secure Otto’s position and paved the way for the king’s later rise as the founder of the Ottonian imperial dynasty.


















