archprince means A prince of an especially high rank. Lexicurio rates it Sui generis — a strength score of 95 out of 100.
Etymology
From arch- + prince.
noun
- A prince of an especially high rank.“[Y]ea vſed only for a pretence and color to inſinuate into the magnifienge off that magnificall ſeigneorie and Archipiſcopall territorie off Canterburye / and by all means poſsible to vante the preheminenece / and ſupereminence off that princely Archpaſtor and paſtorall Archprince / the firſte father and Peter (as I maye ſaye) off which ſuccceſsion / be maketh that ſuperſtitious monke / and wicked”