hortator
/ˈhɔrtətər/Definitions
1. noun
A person who gives a warning, a signal, or a call to action, especially in a formal or official capacity.
“The hortator of the ancient ritual blew the conch shell to signal the start of the ceremony.”
2. noun
In classical Latin, a hortator was a kind of herald or crier.
“The hortator of the Roman army announced the arrival of the enemy forces to the troops.”