So I think the words are clear enough—Nobilissimo Principi FREDERICO GEORGII ffilio Celsissimi, GEORGII Nep: Augustissimi, CAESARI destinato, M. BRITANNIAE spei, Delicijs, Animaq. desideratissimae, PENATES hosce, Annos sesquimille Terra absconditos, voti & Obsequij sui Pignus, sacrari voluit, Guilh: Mulgrave, G. F. ISCANUS.—although if any of that is wrong please let me know.
The basic structure is pretty simple. There's a really long intro of the honoree Prince Frederick, son of the future George II, son of the reigning George I. ("To the Most Noble Prince Frederick, son of the Most High George, Grandson of the Most August George, designated Heir/Caesar, hope of Great Britain, ...") Then, there's a shorter summary of what's going on ("... [wanted] these here Penates, hidden by the Earth for 1500 Years, ... [to be dedicated] ...") and where it's coming from ("... of his own desire and submission to his own Pledge [of loyalty] ...") and then humbly and last the guy himself ("William Musgrave... from Exeter-on-the-Exe").
1) Does anyone have any idea what Delicijs/Deliciis, Animaeq. desideratissimae is doing up there in the middle and what it's going with?
2) Any idea what G. F. would be abbreviating here? This is the guy in question: medical doctor, antiquary, fellow of the Royal Society, alumni of Winchester H.S., New College at Oxford, and Leiden.