IPA: /prəʊˈkɒn.səl/
KK: /proʊˈkɒn.səl/
A high-ranking official who governs a province or territory, especially in a colonial context or in ancient Rome.
The proconsul was responsible for maintaining order and implementing policies in the province.
Proconsul → It is formed from "pro-" (meaning for or in place of) and "consul" (from Latin "consul", meaning a high-ranking official or magistrate). The term refers to an official who acts in place of a consul, typically in a province.
Think of someone acting 'for' ('pro-') a high-ranking official ('consul') — that's why a proconsul is someone who serves in the place of a consul.