There is a place on Bequia named Gelizeau and I know that a will exists for John Maturin Gellizeau of Bequia dated December 17, 1816.
This is located at the Public Records Office(PRO) in London, England.
Catalogue Ref: PROB 11/1587
Dept: Records of the Prerogative Court of Canterbury.
Series: Prerogative Court of Canterbury and related Probate Jurisdictions:Will Registers
Piece: Name of Register:Wynne Quire Numbers:613-650

The image contains 1 will of many for the catalogue reference. You can purchase this document online for three British pounds(as if there's any other type, smile). I recently accessed this info, so hopefully the price has not gone up.