Charles 'The Hammer' Martel was a Frankish leader who played a crucial role in shaping medieval Europe by winning the Battle of Tours in 732. His victory halted the advance of Muslim forces into Western Europe, establishing him as a key figure in defending Christendom and solidifying the power of the Carolingian dynasty. Martel's military strategies and political maneuvers laid the groundwork for the rise of his grandson, Charlemagne, and set the stage for the future of European politics and warfare.