What's the difference between tetrarch and tetrarchical?

Tetrarch

Definition:

• (a.) A Roman governor of the fourth part of a province; hence, any subordinate or dependent prince; also, a petty king or sovereign.
• (a.) Four.

Example Sentences:

Tetrarchical

Definition:

• (a.) Of or pertaining to a tetrarch or tetrarchy.

Example Sentences: