Green’s Dictionary of Slang

a Cavalier.

1645		Relation of Brave Defeat to Skellum Greenvile 4: Sixty great Gunnes shot off, which beat up the dirt bravely about the Cavies eares.
1650		A.B. Mutatus Polemo 15: The Cavies being at that time ready to turn anything, except Roundhead, for some money to be chirpingly drunk [OED].
1664		A. Brome song XLII Songs and Poems 124: The Roundheads and Caveys no more shall be nam’d But all joyn together to make up the ring.