In 1413 John Hert, grocer, bequeathed £40 to the parish to build a new south aisle. Two adjoining plots of land laying to the south of the nave were donated to the church, one by Henry Yevele in 1400, and the other by John Hale, Goldsmith, in 1426. This site was quickly developed into a cloister, used primarily as a graveyard, but undoubtedly with additional symbolic and processional purposes. For example, Henry Crane, citizen and fletcher, requested burial in the cloister of St Magnus Martyr and left 3s 4d to the parish clerks' brotherhood to pray for his soul in his will of 18 July, proved 4 August, 1486.