OATH TO BE TAKEN BY THE FREEMEN OF THE MERCERS’ COMPANY: early 15th Century.

In the Company's records this oath occurs immediately after a curious calendar, written in 15th century hand, and before a list of "Brethren received and incorporated in the time of Rici Attynchin and John Cutlere wardens" in 3 Henry VI., (1424-5).

FIDELITAS.
I shall trewe man be to God o'r Lady Seynt Marie Seynt Mychell th'archangell patrone of the Gylde and to the Fraternite of the Mercers Yremongers and Goldsmythes & Cappers w'in the Towne and Fraunches of Shrowesbury I shall also Trewe man be to the king our liege lorde and to his heyres kyngys and his lawes and mynystars of the same Truly obs've and obey And ov' this I shall be obedyent to my wardens and their sumpneys obey and kepe I shall be trewe and ffeythfull to the Combrethern of the Gylde aforeseyd and ther co'ncell kepe All lawdable and lefull actes and composic'ons made or to be made w*in the Seide Gylde truly obeye p'forme and kepe aft' my reason and power I shall be contributare bere yelde and paye all man' ordynare charges cestes and contribucons aftur my power as any other master occupyer or combrother of the seid Gylde shall happen to doe and bere: Soe helpe me God and halidame and by the Boke.

Hibbert, Francis Aidan. 1891. The influence and development of English gilds: as illustrated by the history of the craft gilds of Shrewsbury. Cambridge: University Press.

Here are two adaptations of the oath to the creation of a Companion of the Order of the Laurel within the Society for Creative Anachronism

I shall true man be to God, our Lady Saint Mary, Saint Michael the archangel patron of the Order and to the Fraternity of the Laurel. I shall also True man be to the king our liege lord and to his heirs kings and his laws and ministers of the same Truly observe and obey. I shall be true and faithful to the Companions of the Order aforesaid and their council keep, All laudable and lawful acts and compositions made or to be made within the Said Order truly obey perform and keep after my reason and power. I shall perform all manner of obligations of the Order after my power as any other master occupier or companion of the Order shall happen to do and bear: So help me God and halidom and by the Book.

Alternative:
 I shall true man be to God, our Lady Saint Mary, Saint Michael the archangel patron of the Order and to the Fraternity of the Laurel. I shall also True man be to the Crown of the East and to their heirs and their laws and ministers of the same Truly observe and obey. I shall be true and faithful to the Companions of the Order aforesaid and their council keep, All laudable and lawful acts and compositions made or to be made within the Said Order truly obey perform and keep after my reason and power. I shall perform all manner of obligations of the Order after my power as any other master occupier or companion of the Order shall happen to do and bear: So help me God and halidom and by the Book