wren collected documents about the life of his father, which were later published after his own death as the "parentalia" by his son stephen in 1750. his portrait, engraved by faber, forms the frontispiece of the "parentalia". two letters written to him by sir christopher while he was quite a youth, were printed in miss phillimore's "life" (pp. 282, 302), that show their relationship was of an affectionate character. the younger christopher was also a numismatist of some repute (hearne, collections, ed. doble, ii. 264), and he published "numismatum antiquorum sylloge" (london, 4to) in 1708.