There are two documents relevant to him, both I think versions of the same Charter, in Latin, with a probable date of c.1204 (with a dating note saying 'death of Earl Donnchad of Carrick'). Presumably Gillescop was a witness to the Charter. Its description is as follows, "Earl Duncan of Carrick, for North Berwick Priory; he has given and granted, and by this charter has established, the church of Maybole (AYR), with lands, chapels, teinds, oblations and all its rights and just pertinents, in pure and perpetual alms". (Ref.: Edinburgh, NAS, MS. GD45/13/282). (Held by Cosmo Innes in 1847).
My blog of 8 February 2009 mentions our clan link to Melrose Abbey and it is of interest that PoMS mentions that Duncan was a patron of Melrose Abbey (Chron. Mel.).