The President of the Senate

The President of the Senate is a title often given to the presiding officer of a senate, and is the speaker of other assemblies.
The senate president often ranks high in a jurisdiction's succession for its top executive office: for example, the President of the Senate of Nigeria is second in line for succession to the presidency, after only the Vice President of the Republic, while in France, which has no vice president, the Senate President is first in line to succeed to the Presidential powers and duties.