Bedfordshire Notes and Queries, Vol 2, p90 has the following transcription of a memorial in Battlesden church (I have added line numbers for ease of reference):
1. Heic Iacet
2. Praenobilis Vir JOHANNES DUNCOMBE
3. Eques Auratus
4. Gulielmi Battlesduni in agro Bedfordiensi Armigeri
5. Et Eliz: Johannis POINTZ Equitis Aurati gnatae filius
6. Eliz: MAIJ antequa et honesta oriundae familia Maritus
7. Ex Septem unico Conjugio natis, unici Gulielmi superstitis Pater,
8. Pater Maritus Filius Optimus Carolo Secundo
9. Triumvir Armamentaritis et a Secretioribus Consiliis
10. Rebus bene gestis haud multo post Quinquevir AEravi Praetor.
11. Res Regias administrabat pura admodum et parca manu
12. Munifica hujus Rex et Dominus, res privatas restituit et auxit
13. Singularis sic comparata res domi
14. Vir
15. Tanti Regis fiducia Spectabilis, tot tantisque muneribus clarus
16. Fide virtute, probitate saeculi concensu et existimatione egregius
17. Sed dimissos post honores, quam praesentis inter Splendores illustrior
18. Respondit ipse quippe Dominus Euge[naeus] Bonus et Fidelis Servus
19. Laeta vox etsi terrena
20. Coelitus olim exaudita
21. Resurgenti; o Beata
22. Obijt
23. IV Nonas Martii
24. Anno Salutis MDCLXXXVII
25. AEtatis Suae LXIV.
I think some of the Latin may be wrong (by the mason or the transcriber) - Nonas in line 23 should probably be Mensis; and filius in the line 5 perhaps should be filia.
Google translate and my limited knowledge of Latin produced the following general sense of the inscription:
"Here lies a noble man John DUNCOMBE, a golden knight, son of William, armiger of Battlesden in Bedfordshire, and Elizabeth daughter of John POINTZ, another golden knight. He was married to Elizabeth MAY. She (or perhaps Sir John) came from a family of ancient and honorable origin. Out of this marriage came 7 children with only son William surviving. Sir John was all round a splendid chap serving King Charles the Second for many years managing the royal affairs with a very pure and frugal hand. The king had great confidence in him and he was famous for many roles, virtuous in faith, and distinguished by his integrity and reputation. The Good and Faithful Servant was called to heaven by the Blessed Risen One and died on the 4th of the month of March in the Year of Salvation 1687 aged 64."
I had particular trouble with lines 9 and 10 which I think say when or how long and in what position Sir John worked for the King.
Any assistance much appreciated.