What best defines a Chancellor?

the Russian head of state

forming a mutual agreement between two nations

Otto von Bismarck of Germany

What best defines a Chancellor is Otto von Bismarck of Germany. Bismarck was the first chancellor of Germany. A chancellor is defined as "a title of various official positions in the government of many nations." It can be used for the following: a head of government, a person in charge of foreign affairs, a person with duties related to social justice, a person in charge of financial and economic issues and the head of a university.