This illustration shows the Half-King Tanacharison (also known as Tanaghrisson), a Seneca Tribe leader, with whom George Washington had an interview. Tanacharison ( c. 1700 -1754), also called Tanaghrisson, was a Native American leader who played a pivotal role in the beginning of the French and Indian War. He was known to European-Americans as the Half-King, a title also used to describe several other historically important Native American leaders. .