It is alſo the very ſame that Prorex is in Latin , to wit, a Vice‐roy: that is,he that in the Kings abſence ſupplyeth his place,and beareth his perſon, as in England the Lord high‐Steward is woont to doe : and more inferiourly it is a deputy or officer under ſome noble man, &c.
Source: wiktionary