Robert Blacader (1484-1508) was high in favour with King James IV., and was one of the embassy sent to England to arrange the marriage of the Scottish monarch with the daughter of Henry VII. James had previously sought consolation under the Bishop's care, enrolled himself as a prebendary in the cathedral, and in person attended as a member of the cathedral-chapter. The King was always favourable to Glasgow, and did not desire the see to be subordinate to that of St. Andrews. He urged upon the Pope that the pallium should be granted to the Bishop of Glasgow, whose cathedral, he urged, "surpasses the other cathedral churches of my realm by its structure, its learned men, its foundation, its ornaments, and other very noble prerogatives." A bull was granted in 1491-1492 by Pope Innocent VIII. in which he declared the see to be metropolitan, and appointed the bishops of Dunkeld, Dunblane, Galloway, and Argyll to be its suffragans.[70] Blacader was the first Archbishop of Glasgow, and beautified his cathedral by building or adorning the fine rood-screen which separates the nave from the choir[71] by founding altarages and erecting two altars in front of the rood-screen, on both of which his arms and initials are carved.[72] He built also the decorated flights of steps from the aisles of the nave to the choir, and partly erected the building in continuation of the south transept, called Blacader's aisle, but it was never carried higher than the ground storey or crypt.[73] It is also known as Fergus's aisle.[74] Archbishop Blacader was the last to add to the cathedral, and there is reason to believe that his addition occupies the site of the cemetery consecrated by St. Ninian, and thus the earliest consecration and the latest building effort are identified with the same spot.[75]