custos

Before 1888 the clerk of the peace was appointed in a county by the custos rotulorum.

I enquired, finding that the old custos was more inclined to speak of his predecessor than himself.

His Honour the Superintendent might have assumed the classical motto, "Custos sum pauperis horti."

The Duke of York was appointed custos person of the King, and received in that capacity 10,000ℓ.

This is the same animal which a naturalist of the last century named the Cancer custos.