chief constable

:  accorded highest rank or office

:  of greatest importance or influence

:  chiefly

:  the upper part of a heraldic field

:  the head of a body of persons or an organization :  leader

:  the principal or most valuable part

:  a high officer of a royal court or noble household especially in the Middle Ages

:  the warden or governor of a royal castle or a fortified town

:  a public officer usually of a town or township responsible for keeping the peace and for minor judicial duties