Gerefa

In Saxon law. Greve, reve or reeve; a ministerial officer of high antiquity in England; answering to the grave or graf (grafio) of the early continental nations. The term was applied to various grades of officers, from the scyre-gerefa, shire-grefe or shire-reve, who had charge of the county, (and whose title and office have bsen perpetuated in the modern "'sheriff,") down to the tun-geref a or town-reeve, and lower.

Burrill.