Griffith Powell, the fifth Principal, had been a considerable benefactor, and was the first to extend the buildings of the College since the foundation. He began to enlarge it by the addition of the buttery, kitchen, and hall; but dying before they could be completed, he left them, together with the south side of the outer quadrangle, to be completed by Sir Eubule Thelwall, “that most bountiful person, who left nothing undone that might conduce to the good of the College.” Francis Mansell, his successor, was a Fellow of All Souls, but had been a commoner of the College. He was third son of Sir Francis Mansell, of Muddlescomb, in the county of Carmarthen. Of him we have very full information from the _Life_,[291] by Sir Leoline Jenkins, which presents a most interesting and vivid picture of the troublous times in which he lived. Dr. Francis Mansell performed the unprecedented feat of holding the Principalship three times, being twice appointed, and once restored, to the office. He watched the growth of the buildings under the two great benefactors--Sir Eubule Thelwall and Sir Leoline Jenkins; and he himself aided the work by his advice, gifts, and diligence in collecting contributions. On Mansell’s resignation of the Principalship in 1621 his place was filled by Sir Eubule Thelwall. He was the fifth son of John Thelwall of Bathavarn Park in the county of Denbigh, bred in Trinity College in Cambridge till he was Bachelor of Arts, then coming to Oxford, was incorporated here in the same degree in 1579. Afterwards Master of Arts of this University, Counsellor at Law, Master of the Alienation Office, and one of the Masters in Chancery, he was admitted Principal in the month of May 1621. He procured from King James a new charter (mentioned above), and greatly increased the buildings of the College, not only completing the kitchen, buttery, and hall, but adding a house for the Principal, and the chapel--which, however, was afterwards enlarged by the addition (in 1636) of a sacrarium. He also built a library, “with a walk under,” probably a colonnade, to the north of the Hall and west of his new house; but it is doubtful whether he meant this to be a permanent building. He enlarged the foundation, augmented the endowments of the College, and enriched the library with books. He died October 8th, 1630, and was buried in the chapel.