Proconsul (noun)

1. A governor of a province in the Roman Republic or Empire who was not a consul, but acted with the powers of a consul.
2. A person appointed or elected to act as the representative of another, especially an official representative of a government or organization.

Origin:

From latin pro- ("on behalf of") + consul.

Examples:

1. The proconsul governed the province with complete autonomy.
2. As a proconsul, he was responsible for maintaining order and enforcing Roman law.
3. The ambassador acted as a proconsul, making decisions on behalf of the government.
4. Proconsuls were appointed by the Roman Senate to govern newly conquered territories.
5. The company's CEO acted as a proconsul, making all important decisions on behalf of the board.