See Ian Spink, Restoration Cathedral Music 1660-1714 (OUP, 1995), for notes on Ingelo and Rogers; see Woods Ath Oxon, 4:307
A manuscript note on the verso of O1 reads: "This musique was performed at Guildhall in the year 1660. at the great ffeast, for King Charles the second, (with about 20 of his maties servants, and the 2 Houses of pliament at Dinner in the said Hall: Composed by Ben: Rogers then of Windsor by order of Sir Tho: Allen Lord mayor, and the Court of Aldermen formed to his Maties Great Satisfaction being Instrumentall, and Vocall Musique in Lattin. about the year 1653 was severall sets of Avis of the gd B[enjamin]. R[ogers]. for the violins, and organ, of 4 parts, sent into Germany for the ArchDuke Leopolds Court, (who is now Emporour) and plaid there by his own Musitians to his great content He himself, being a Composer."
Woods' futher manuscript note to his copy of the Latin version, Hymnus Eucharisticus at O3 reads: "Made by Dr Nathan Ingelo, Fellow of Eaton Coll. near Windsor, sometimes of Qu. coll in Cambridge -- -an. 1660. It was then put into English by the author. To His Hymnus Eucharisticus Ben. Rogers of Windsor, Bach. of Musick, did at the request of the Lord Mayor of Lond. & Aldmen compose a song of four parts. This song was admirably well pformed by about 12. voices, 12 Instruments & an Organ, by mostly his Majesties servants, in the Guildhall of the citie of London, on the 12 [ie 5]of July (thursday) 1660, on wh. day his maj. K Ch.2. James Duke of York Hen. Duke of Gloc. & both Houses of parliament were entertained with a most sumptuous dinner & banquet. Copies of these paps were printed in Lat. & English: one was delivered to the K. & the two Dukes & others to the Nobility for purposely that they might look on them when it was pformed by the said servants belonging to his majesty. It gave very great content, & Benj. Rogers who composed the song, being then present, gained great credit for wt he had done, & a good reward. It was sung in the Lat. tongue."
The Guildhall entertainment at which this piece was performed actually took place on Thursday, 5 July (see ms note O2 and Ath Oxon ref above). John Tatham's London's Glory provides a full account; see also Pepys, 1:193; Parliamentary Intelligencer (2-9 July), pp. 445-6; Mercurius Publicus 28 (5-12 July), pp. 437-8; Rugg, pp. 98-9. Preparations for the celebration had started before Charles's arrival in London, according to the Loyal Scout 102 (29 May-6 June), p. 419.