James III confirms in mortmain a charter of the late Thomas, bishop of Aberdeen whereby he granted to God, Blessed Mary, our patron, and a chaplain celebrating, and to celebrate perpetually, divine service in Aberdeen cathedral at whatever altar seemed best to him and his successors for the souls of his parents, acquaintances, ancestors, successors and all benefactors, various annual rents. Mention is made of the river of the Holy Trinity commonly called 'the Trinity burn'. The charter is dated 2 February 1478.

Jacobus Dei gratia rex Scottorum . . . Sciatis nos quandam cartam per quondam reuerendum in Christo patrem Thomam episcopum Aberdonensem . . . de mandato nostro . . . diligenter examinatam . . . ad plenum intellexisse sub hac forma . . . Thomas . . . episcopus Abbirdonensis . . . Noueritis nos dedisse . . . Deo et beate Marie nostre patrone ac vni capellano diuina celebranti et imperpetuum celebraturo in ecclesia nostra cathedrali Abbirdonensi ad quodcunque altare prout nobis et successoribus nostris episcopis Abbirdonensis melius videbitur expedire pro anima nostra parentum amicorum antecessorum successorum et omnium benefactorum trorum {sic.} {. . .} vsque ad ripariam sancte Trinitatis vulgariter nuncupatam le trinite burn {. . .}