During this year Dr. Wren was elected, by the unanimous wish of the fellows, Master of Peterhouse, Cambridge, where he 'exercised such prudence and moderation in his government that he reduced all the fellows to one sacred bond of unity and concord.' Besides this he rebuilt the college in great part from the ground, and perceiving that the absence of a chapel was a great obstacle in the way of reverent and frequent services, he did not rest until he had raised subscriptions enough to build a handsome chapel, and to ornament it richly.[12] The wood-panelled hexagonal roof, the marble steps on which the altar stands, flanked by two tall candlesticks, give a character to the interior enhanced by the east window, which is in part a copy of that famous picture of the Crucifixion, then just finished, by Rubens, at Antwerp. This window was carefully taken down in the Rebellion before the college was visited, and hidden away in boxes. A wise precaution, for the commissioners destroyed all the other ornaments, pulling down 'two mighty angels with wings, divers other angels, the four evangelists, and Peter with his keys on the chapel door, together with about a hundred cherubim and many superstitious letters in gold. Moreover,' they say, 'we found six angels on the windows which we defaced.' After the Restoration the hidden glass was brought forth again and put back in its place over the altar.[13] While Dr. Wren was thus adorning his college chapel King Charles did not show himself forgetful of Bishop Andrewes' well-loved pupil and chaplain, but in 1628 appointed him Dean of Windsor and registrar of the Order of the Garter. The year after this appointment the peace between England and France was solemnly ratified in the chapel at Windsor and Dean Wren administered the oath to the French ambassador, the Marquis de Châteauneuf.